Quantum Computation and Communication
Quantum Information
Quantum Networking
Quantum Cryptography
Education
PhD in Quantum Information with Highest Distinction (Mark: 3.0/3.0), (2013) Doctoral School of Information Science and Technology
Faculty of Electrical Engineering and Informatics
Budapest University of Technology and Economics
PhD Thesis:
Information Geometric Superactivation of Asymptotic Quantum Capacity and Classical Zero-Error Capacity of Zero-Capacity Quantum Channels PhD Thesis (PDF)
Advisor: Prof. Sandor Imre
Head of Department
Department of Networked Systems and Services, Budapest University of Technology and Economics
M.Sc. in Theoretical Computer Science with Honors (2008) Department of Networked Systems and Services
Faculty of Electrical Engineering and Informatics
Budapest University of Technology and Economics
M.Sc Thesis: Quantum Copy-Protection Based on Holographic Data Storage
Diploma with Honors
Advisor: Prof. Sandor Imre
Head of Department
Department of Networked Systems and Services, Budapest University of Technology and Economics
Professional Experience
Research Associate in Quantum Information and Computation
Faculty of Electrical Engineering and Informatics
Budapest University of Technology and Economics
Research Group Leader, Quantum Internet
MTA Premium Postdoctoral Research Program
Hungarian Academy of Sciences
Researcher in Quantum Computation
School of Electronics and Computer Science, University of Southampton
Southampton SO17 1BJ, UK.
Researcher in Quantum Networking and Quantum Key Distribution
U.S. Army Research Laboratory (ARL)-BME
International collaboration in quantum networking and quantum communications
Researcher in Quantum Information
MTA-BME Information Systems Research Group
Mathematics and Natural Sciences
Hungarian Academy of Sciences
Lecturer in Quantum Information and Computation Faculty of Electrical Engineering and Informatics
Budapest University of Technology and Economics
Selected Publications
L. Gyongyosi, S. Imre. Advances in the Quantum Internet, Communications of the ACM, DOI: 10.1145/3524455, 2022.
The quantum Internet utilizes the fundamental concepts of quantum mechanics for networking. The entangled network structure of the quantum Internet formulates a high-complexity network space with several advantages and challenges. The quantum supremacy of the quantum Internet refers to those advances and properties that are not available in any traditional Internet setting. Here, we review the attributes of quantum supremacy of the quantum Internet, addressing the requirements and proposals, the recent implementation basis, and the open problems.
Article "Advances in the Quantum Internet" on the cover of Communications of the ACM, Volume 65 Issue 8, pp. 52-63, DOI: 10.1145/3524455, 2022.
L. Gyongyosi. Adaptive Problem Solving Dynamics in Gate-Model Quantum Computers, Entropy, DOI: 10.3390/e24091196, 2022.
Gate-model quantum computer architectures represent an implementable model used to realize quantum computations. The mathematical description of the dynamical attributes of adaptive problem solving and iterative objective function evaluation in a gate-model quantum computer is currently a challenge. Here, a mathematical model of adaptive problem solving dynamics in a gate-model quantum computer is defined. We characterize a canonical equation of adaptive objective function evaluation of computational problems. We study the stability of adaptive problem solving in gate-model quantum computers.
L. Gyongyosi, S. Imre. Scalable Distributed Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-76728-5, www.nature.com/articles/s41598-020-76728-5, 2021.
A scalable model for a distributed quantum computation is a challenging problem due to the complexity of the problem space provided by the diversity of possible quantum systems, from small-scale quantum devices to large-scale quantum computers. Here, we define a model of scalable distributed gate-model quantum computation in near-term quantum systems of the NISQ (noisy intermediate scale quantum) technology era. We prove that the proposed architecture can maximize an objective function of a computational problem in a distributed manner. We study the impacts of decoherence on distributed objective function evaluation.
L. Gyongyosi. Post-Processing Optimization for Continuous-Variable Quantum Key Distribution, Theoretical Computer Science, DOI: 10.1016/j.tcs.2021.08.023, 2021.
The performance of a continuous-variable quantum key distribution (CVQKD) protocol depends on the efficiency of the post-processing of measurement results. The post-processing methods extract statistical information from the raw data, establish the mutual knowledge between the parties, and produce a final key that provides absolute security. The post-processing phase is a bottleneck in CVQKD with crucial importance to the efficiency and protocol attributes. Post-processing uses the raw data of the parties generated by the quantum-level transmission and a classical authenticated channel to generate a secret key between the parties. The current reconciliation procedures require high-complexity coding with moderate resulting efficiency. Here we define an optimization method for post-processing in continuous-variable quantum key distribution. The reconciliation method achieves additive Gaussian noise on the random secret for arbitrarily low dimensional blocks. The model consumes all information from the raw data blocks to provide maximal efficiency and security via standard operations. The results can be realized by generic Gaussian coding schemes, allowing an easily implementation for experimental CVQKD protocols.
L. Gyongyosi. Energy Transfer and Thermodynamics of Quantum Gravity Computation, Chaos, Solitons & Fractals, DOI: 10.1016/j.csfx.2020.100050, 2020.
In a quantum gravity environment, the processes and events are causally non-separable because the term of time and the time-steps have no interpretable meaning in a non-fixed causality structure. Here, we study the energy transfer and thermodynamics of quantum gravity computations. We show that a non-fixed causality stimulates entropy transfer between the quantum gravity environment and the independent local systems of the quantum gravity space. We prove that the entropy transfer reduces the entropies of the contributing local systems and increases the entropy of the quantum gravity environment. We reveal on a smooth Cauchy slice that the space-time geometry of the quantum gravity environment dynamically adapts to the vanishing causality. We define the corresponding Hamiltonians and the causal development of the quantum gravity environment.
L. Gyongyosi, S. Imre. Resource Prioritization and Balancing for the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-78960-5, www.nature.com/articles/s41598-020-78960-5, 2020.
The quantum Internet enables networking based on the fundamentals of quantum mechanics. Here, methods and procedures of resource prioritization and resource balancing are defined for the quantum Internet. We define a model for resource consumption optimization in quantum repeaters, and a strongly-entangled network structure for resource balancing. We study the resource-balancing efficiency of the strongly-entangled structure. We prove that a strongly-entangled quantum network is two times more efficient in a resource balancing problem than a full-mesh network of the traditional Internet.
L. Gyongyosi. Decoherence Dynamics Estimation for Superconducting Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-020-02863-7, 2020.
Superconducting gate-model quantum computer architectures provide an implementable model for practical quantum computations in the NISQ (noisy intermediate scale quantum) technology era. Due to hardware restrictions and decoherence, generating the physical layout of the quantum circuits of a gate-model quantum computer is a challenge. Here, we define a method for layout generation with a decoherence dynamics estimation in superconducting gate-model quantum computers. We propose an algorithm for the optimal placement of the quantum computational blocks of gate-model quantum circuits. We study the effects of capacitance interference on the distribution of the Gaussian noise in the Josephson energy.
L. Gyongyosi. Objective Function Estimation for Solving Optimization Problems in Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-71007-9, www.nature.com/articles/s41598-020-71007-9, 2020.
Quantum computers provide a valuable resource to solve computational problems. The maximization of the objective function of a computational problem is a crucial problem in gate-model quantum computers. The objective function estimation is a high-cost procedure that requires several rounds of quantum computations and measurements. Here, we define a method for objective function estimation of arbitrary computational problems in gate-model quantum computers. The proposed solution significantly reduces the costs of the objective function estimation and provides an optimized estimate of the state of the quantum computer for solving optimization problems.
L. Gyongyosi. Unsupervised Quantum Gate Control for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-67018-1, www.nature.com/articles/s41598-020-67018-1, 2020.
In near-term quantum computers, the operations are realized by unitary quantum gates. The precise and stable working mechanism of quantum gates is essential for the implementation of any complex quantum computations. Here, we define a method for the unsupervised control of quantum gates in near-term quantum computers. We model a scenario in which a tensor product structure of non-stable quantum gates is not controllable in terms of control theory. We prove that the non-stable quantum gate becomes controllable via a machine learning method if the quantum gates formulate an entangled gate structure.
L. Gyongyosi, S. Imre. Circuit Depth Reduction for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-67014-5, www.nature.com/articles/s41598-020-67014-5, 2020.
Quantum computers utilize the fundamentals of quantum mechanics to solve computational problems more efficiently than traditional computers. Gate-model quantum computers are fundamental to implement near-term quantum computer architectures and quantum devices. Here, a quantum algorithm is defined for the circuit depth reduction of gate-model quantum computers. The proposed solution evaluates the reduced time complexity equivalent of a reference quantum circuit. We prove the complexity of the quantum algorithm and the achievable reduction in circuit depth. The method provides a tractable solution to reduce the time complexity and physical layer costs of quantum computers.
L. Gyongyosi. Dynamics of Entangled Networks of the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-68498-x, www.nature.com/articles/s41598-020-68498-x, 2020.
Entangled quantum networks are a fundamental of any global-scale quantum Internet. Here, a mathematical model is developed to quantify the dynamics of entangled network structures and entanglement flow in the quantum Internet. The analytical solutions of the model determine the equilibrium states of the entangled quantum networks and characterize the stability, fluctuation attributes, and dynamics of entanglement flow in entangled network structures. We demonstrate the results of the model through various entangled structures and quantify the dynamics.
L. Gyongyosi, S. Imre. Routing SpaceExploration for Scalable Routing in the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-68354-y, www.nature.com/articles/s41598-020-68354-y, 2020.
The entangled network structure of the quantum Internet formulates a high complexity routing space that is hard to explore. Scalable routing is a routing method that can determine an optimal routing at particular subnetwork conditions in the quantum Internet to perform a high-performance and low-complexity routing in the entangled structure. Here, we define a method for routing space exploration and scalable routing in the quantum Internet. We prove that scalable routing allows a compact and efficient routing in the entangled networks of the quantum Internet.
L. Gyongyosi. Quantum State Optimization and Computational Pathway Evaluation for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-61316-4, www.nature.com/articles/s41598-020-61316-4, 2020.
A computational problem fed into a gate-model quantum computer identifies an objective function with a particular computational pathway (objective function connectivity). The solution of the computational problem involves identifying a target objective function value that is the subject to be reached. A bottleneck in a gate-model quantum computer is the requirement of several rounds of quantum state preparations, high-cost run sequences, and multiple rounds of measurements to determine a target (optimal) state of the quantum computer that achieves the target objective function value. Here, we define a method for optimal quantum state determination and computational path evaluation for gate-model quantum computers. We prove a state determination method that finds a target system state for a quantum computer at a given target objective function value. The computational pathway evaluation procedure sets the connectivity of the objective function in the target system state on a fixed hardware architecture of the quantum computer. The proposed solution evolves the target system state without requiring the preparation of intermediate states between the initial and target states of the quantum computer. Our method avoids high-cost system state preparations and expensive running procedures and measurement apparatuses in gate-model quantum computers. The results are convenient for gate-model quantum computations and the near-term quantum devices of the quantum Internet.
L. Gyongyosi, S. Imre. Theory of Noise-Scaled Stability Bounds and Entanglement Rate Maximization in the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-58200-6, www.nature.com/articles/s41598-020-58200-6, 2020.
Crucial problems of the quantum Internet are the derivation of stability properties of quantum repeaters and theory of entanglement rate maximization in an entangled network structure. The stability property of a quantum repeater entails that all incoming density matrices can be swapped with a target density matrix. The strong stability of a quantum repeater implies stable entanglement swapping with the boundness of stored density matrices in the quantum memory and the boundness of delays. Here, a theoretical framework of noise-scaled stability analysis and entanglement rate maximization is conceived for the quantum Internet. We define the term of entanglement swapping set that models the status of quantum memory of a quantum repeater with the stored density matrices. We determine the optimal entanglement swapping method that maximizes the entanglement rate of the quantum repeaters at the different entanglement swapping sets as function of the noise of the local memory and local operations. We prove the stability properties for non-complete entanglement swapping sets, complete entanglement swapping sets and perfect entanglement swapping sets. We prove the entanglement rates for the different entanglement swapping sets and noise levels. The results can be applied to the experimental quantum Internet.
L. Gyongyosi, S. Imre. Subcarrier Domain of Multicarrier Continuous-Variable Quantum Key Distribution, Journal of Statistical Physics, Springer Nature, DOI: 10.1007/s10955-019-02404-2, 2019.
The subcarrier domain of multicarrier continuous-variable quantum key distribution (CVQKD) is defined. In a multicarrier CVQKD scheme, the information is granulated into Gaussian subcarrier CVs and the physical Gaussian link is divided into Gaussian subchannels. The subcarrier domain injects physical attributes to the description of the subcarrier transmission.We prove that the subcarrier domain is a natural representation of the subcarrierlevel transmission in a multicarrier CVQKD scheme. We also extend the subcarrier domain to a multiple-access multicarrier CVQKD setting. We demonstrate the results through the adaptive multicarrier quadrature-division (AMQD) CVQKD scheme and the AMQD-MQA (multiuser quadrature allocation) multiple-access multicarrier scheme. The subcarrier domain representation provides a general apparatus that can be utilized for an arbitrary multicarrier CVQKD scenario.
L. Gyongyosi, S. Imre. Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices, Scientific Reports, Nature, DOI: 10.1038/s41598-019-56689-0, www.nature.com/articles/s41598-019-56689-0, 2019.
Quantum memories are a fundamental of any global-scale quantum Internet, high-performance quantum networking and near-term quantum computers. A main problem of quantum memories is the low retrieval efficiency of the quantum systems from the quantum registers of the quantum memory. Here, we define a novel quantum memory called high-retrieval-efficiency (HRE) quantum memory for near-term quantum devices. An HRE quantum memory unit integrates local unitary operations on its hardware level for the optimization of the readout procedure and utilizes the advanced techniques of quantum machine learning. We define the integrated unitary operations of an HRE quantum memory, prove the learning procedure, and evaluate the achievable output signal-to-noise ratio values. We prove that the local unitaries of an HRE quantum memory achieve the optimization of the readout procedure in an unsupervised manner without the use of any labeled data or training sequences. We show that the readout procedure of an HRE quantum memory is realized in a completely blind manner without any information about the input quantum system or about the unknown quantum operation of the quantum register. We evaluate the retrieval efficiency of an HRE quantum memory and the output SNR (signal-to-noise ratio). The results are particularly convenient for gate-model quantum computers and the near-term quantum devices of the quantum Internet.
L. Gyongyosi, S. Imre. Training Optimization for Gate-Model Quantum Neural Networks, Scientific Reports, Nature, DOI: 10.1038/s41598-019-48892-w, www.nature.com/articles/s41598-019-48892-w, 2019.
Gate-based quantum computations represent an essential to realize near-term quantum computer architectures. A gate-model quantum neural network (QNN) is a QNN implemented on a gate-model quantum computer, realized via a set of unitaries with associated gate parameters. Here, we define a training optimization procedure for gate-model QNNs. By deriving the environmental attributes of the gate-model quantum network, we prove the constraint-based learning models. We show that the optimal learning procedures are different if side information is available in different directions, and if side information is accessible about the previous running sequences of the gate-model QNN. The results are particularly convenient for gate-model quantum computer implementations.
L. Gyongyosi, S. Imre. A Survey on Quantum Computing Technology, Computer Science Review, Elsevier, DOI: 10.1016/j.cosrev.2018.11.002, 2019.
The power of quantum computing technologies is based on the fundamentals of quantum mechanics, such as quantum superposition, quantum entanglement, or the no-cloning theorem. Since these phenomena have no classical analogue, similar results cannot be achieved within the framework of traditional computing. The experimental insights of quantum computing technologies have already been demonstrated, and several studies are in progress. Here we review the most recent results of quantum computation technology and address the open problems of the field.
L. Gyongyosi, S. Imre. State Stabilization for Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2397-0, 2019.
Gate-model quantum computers can allow quantum computations in near-term implementations. The stabilization of an optimal quantum state of a quantum computer is a challenge, since it requires stable quantum evolutions via a precise calibration of the unitaries. Here, we propose a method for the stabilization of an optimal quantum state of a quantum computer through an arbitrary number of running sequences. The optimal state of the quantum computer is set to maximize an objective function of an arbitrary problem fed into the quantum computer. We also propose a procedure to classify the stabilized quantum states of the quantum computer into stability classes. The results are convenient for gate-model quantum computations and near-term quantum computers.
L. Gyongyosi, S. Imre. Multiple Access Multicarrier Continuous-Variable Quantum Key Distribution, Chaos, Solitons & Fractals, DOI: 10.1016/j.chaos.2018.07.006, 2018.
One of the most important practical realizations of the fundamentals of quantum mechanics is continuous-variable quantum key distribution (CVQKD). Here we propose the adaptive multicarrier quadrature division-multiuser quadrature allocation (AMQD-MQA) multiple access technique for continuous-variable quantum key distribution. The MQA scheme is based on the AMQD modulation, which granulates the inputs of the users into Gaussian subcarrier continuous-variables (CVs). In an AMQD-MQA multiple access scenario, the simultaneous reliable transmission of the users is handled by the dynamic allocation of the Gaussian subcarrier CVs. We propose two different settings of AMQD-MQA for multiple input-multiple output communication. We introduce a rate-selection strategy that tunes the modulation variances and allocates adaptively the quadratures of the users over the sub-channels. We also prove the rate formulas if only partial channel side information is available for the users of the sub-channel conditions. We show a technique for the compensation of a nonideal Gaussian input modulation, which allows the users to overwhelm the modulation imperfections to reach optimal capacity-achieving communication over the Gaussian sub-channels. We investigate the diversity amplification of the sub-channel transmittance coefficients and reveal that a strong diversity can be exploited by opportunistic Gaussian modulation.
The multicarrier continuous-variable quantum key distribution (CVQKD) protocol is defined. In a CVQKD protocol, the information is conveyed by coherent quantum states. The quantum continuous variables are sent through a noisy quantum channel. For a quantum channel with additive-multiplicative noise both additive and multiplicative disturbances are present in the transmission. The multiplicative disturbance is an inherent attribute of diverse physical environments. Physical links with additive and multiplicative disturbances can represent a more general approach than purely additive noise links in several practical scenarios. In a standard CVQKD setting, the noise is modeled as an additive white Gaussian noise caused by an eavesdropper (Gaussian quantum link). As a corollary, standard CVQKD protocols are not optimal for arbitrary Gaussian quantum channels if multiplicative disturbances are also present in the physical link. Here, we define the adaptive multicarrier quadrature division (AMQD) modulation technique for CVQKD. The AMQD method is optimal for arbitrary Gaussian quantum channels with arbitrary multiplicative disturbances. The protocol granulates the Gaussian random input into Gaussian subcarrier continuous variables in the encoding phase, which are then decoded by a continuous unitary transformation. The subcarrier coherent variables formulate sub-channels from the physical link which leads to improved transmission efficiency, higher tolerable loss, and excess noise in comparison to standard CVQKD protocols. We also derive the security proof of multicarrier CVQKD at optimal Gaussian attacks in the finite-size and asymptotic regimes.
L. Gyongyosi, S. Imre. Quantum Circuit Design for Objective Function Maximization in Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2326-2, 2019.
Gate-model quantum computers provide an experimentally implementable architecture for near-term quantum computations. To design a reduced quantum circuit that can simulate a high-complexity reference quantum circuit, an optimization should be taken on the number of input quantum states, on the unitary operations of the quantum circuit, and on the number of output measurement rounds. Besides the optimization of the physical layout of the hardware layer, the quantum computer should also solve difficult computational problems very efficiently. To yield a desired output system, a particular objective function associated with the computational problem fed into the quantum computer should be maximized. The reduced gate structure should be able to produce the maximized value of the objective function. These parallel requirements must be satisfied simultaneously, which makes the optimization difficult. Here, we demonstrate a method for designing quantum circuits for gate-model quantum computers and define the Quantum Triple Annealing Minimization (QTAM) algorithm. The aim of QTAM is to determine an optimal reduced topology for the quantum circuits in the hardware layer at the maximization of the objective function of an arbitrary computational problem.
L. Gyongyosi, S. Imre. Dense Quantum Measurement Theory, Scientific Reports, Nature, DOI: 10.1038/s41598-019-43250-2, www.nature.com/articles/s41598-019-43250-2, 2019.
Quantum measurement is a fundamental cornerstone of experimental quantum computations. The main issues in current quantum measurement strategies are the high number of measurement rounds to determine a global optimal measurement output and the low success probability of finding a global optimal measurement output. Each measurement round requires preparing the quantum system and applying quantum operations and measurements with high-precision control in the physical layer. These issues result in extremely high-cost measurements with a low probability of success at the end of the measurement rounds. Here, we define a novel measurement for quantum computations called dense quantum measurement. The dense measurement strategy aims at fixing the main drawbacks of standard quantum measurements by achieving a significant reduction in the number of necessary measurement rounds and by radically improving the success probabilities of finding global optimal outputs. We provide application scenarios for quantum circuits with arbitrary unitary sequences, and prove that dense measurement theory provides an experimentally implementable solution for gate-model quantum computer architectures.
L. Gyongyosi, S. Imre. Opportunistic Entanglement Distribution for the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-019-38495-w, www.nature.com/articles/s41598-019-38495-w, 2019.
Quantum entanglement is a building block of the entangled quantum networks of the quantum Internet. A fundamental problem of the quantum Internet is entanglement distribution. Since quantum entanglement will be fundamental to any future quantum networking scenarios, the distribution mechanism of quantum entanglement is a critical and emerging issue in quantum networks. Here we define the method of opportunistic entanglement distribution for the quantum Internet. The opportunistic model defines distribution sets that are aimed to select those quantum nodes for which the cost function picks up a local minimum. The cost function utilizes the error patterns of the local quantum memories and the predictability of the evolution of the entanglement fidelities. Our method provides efficient entanglement distributing with respect to the actual statuses of the local quantum memories of the node pairs. The model provides an easily-applicable, moderate-complexity solution for high-fidelity entanglement distribution in experimental quantum Internet scenarios.
L. Gyongyosi, S. Imre. Multilayer Optimization for the Quantum Internet, Scientific Reports, Nature, DOI:10.1038/s41598-018-30957-x, www.nature.com/articles/s41598-018-30957-x, 2018.
We define a multilayer optimization method for the quantum Internet. Multilayer optimization integrates separate procedures for the optimization of the quantum layer and the classical layer of the quantum Internet. The multilayer optimization procedure defines advanced techniques for the optimization of the layers. The optimization of the quantum layer covers the minimization of total usage time of quantum memories in the quantum nodes, the maximization of the entanglement throughput over the entangled links, and the reduction of the number of entangled links between the arbitrary source and target quantum nodes. The objective of the optimization of the classical layer is the cost minimization of any auxiliary classical communications. The multilayer optimization framework provides a practically implementable tool for quantum network communications, or long-distance quantum communications.
L. Gyongyosi, S. Imre. Decentralized Base-Graph Routing for the Quantum Internet, Physical Review A, American Physical Society, DOI: 10.1103/PhysRevA.98.022310, 2018.
Quantum repeater networks are a fundamental of any future quantum internet and long-distance quantum communications. The entangled quantum nodes can communicate through several different levels of entanglement, leading to a heterogeneous, multilevel network structure. The level of entanglement between the quantum nodes determines the hop distance and the probability of the existence of an entangled link in the network. Here, we define a decentralized routing for entangled quantum networks. The proposed method allows an efficient routing to find the shortest paths in entangled quantum networks by using only local knowledge of the quantum nodes. We give bounds on the maximum value of the total number of entangled links of a path. The proposed scheme can be directly applied in practical quantum communications and quantum networking scenarios.
L. Gyongyosi, S. Imre, H. V. Nguyen. A Survey on Quantum Channel Capacities, IEEE Communications Surveys and Tutorials, IEEE, 10.1109/COMST.2017.2786748, 2018.
Quantum information processing exploits the quantum nature of information. It offers fundamentally new solutions in the field of computer science and extends the possibilities to a level that cannot be imagined in classical communication systems. For quantum communication channels, many new capacity definitions were developed in comparison to classical counterparts. A quantum channel can be used to realize classical information transmission or to deliver quantum information, such as quantum entanglement. Here we review the properties of the quantum communication channel, the various capacity measures and the fundamental differences between the classical and quantum channels.
IEEE Communications Surveys and Tutorials, Vol 20, Issue 2, pp. 1149-1205, ISSN 1553-877X, IEEE, DOI: 10.1109/COMST.2017.2786748, 2018.
We define the entanglement-gradient routing scheme for quantum repeater networks. The routing framework fuses the fundamentals of swarm intelligence and quantum Shannon theory. Swarm intelligence provides nature-inspired solutions for problem solving. Motivated by models of social insect behavior, the routing is performed using parallel threads to determine the shortest path via the entanglement gradient coefficient, which describes the feasibility of the entangled links and paths of the network. The routing metrics are derived from the characteristics of entanglement transmission and relevant measures of entanglement distribution in quantum networks. The method allows a moderate complexity decentralized routing in quantum repeater networks. The results can be applied in experimental quantum networking, future quantum Internet, and long-distance quantum communications.
L Gyongyosi. Quantum Imaging of High-Dimensional Hilbert Spaces with Radon Transform, International Journal of Circuit Theory and Applications(IJCTA), Special Issue on Quantum Circuits (Wiley), DOI: 10.1002/cta.2332, 2017.
High-dimensional Hilbert spaces possess large information encoding and transmission capabilities. Characterizing exactly the real potential of high-dimensional entangled systems is a cornerstone of tomography and quantum imaging. The accuracy of the measurement apparatus and devices used in quantum imaging is physically limited, which allows no further improvements to be made. To extend the possibilities, we introduce a post-processing method for quantum imaging that is based on the Radon transform and the projection-slice theorem. The proposed solution leads to an enhanced precision and a deeper parameterization of the information conveying capabilities of high-dimensional Hilbert spaces. We demonstrate the method for the analysis of high-dimensional position-momentum photonic entanglement. We show that the entropic separability bound in terms of standard deviations is violated considerably more strongly in comparison to the standard setting and current data processing. The results indicate that the possibilities of the quantum imaging of high-dimensional Hilbert spaces can be extended by applying appropriate calculations in the post-processing phase.
International Journal of Circuit Theory and Applications, Special Issue: Quantum Circuits, Vol. 45, Issue 7, pp. 1029-1046, DOI: 10.1002/cta.2332, 2017.
L. Gyongyosi, S. Imre. Gaussian Quadrature Inference for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation IX, DOI: 10.1117/12.2223482, 2016.
We propose the Gaussian quadrature inference (GQI) method for multicarrier continuous-variable quantum key distribution (CVQKD). A multicarrier CVQKD protocol utilizes Gaussian subcarrier quantum continuous variables (CV) for information transmission. The GQI framework provides a minimal error estimate of the quadratures of the CV quantum states from the discrete, measured noisy subcarrier variables. GQI utilizes the fundamentals of regularization theory and statistical information processing. We characterize GQI for multicarrier CVQKD, and define a method for the statistical modeling and processing of noisy Gaussian subcarrier quadratures. We demonstrate the results through the adaptive multicarrier quadrature division (AMQD) scheme. We introduce the terms statistical secret key rate and statistical private classical information, which quantities are derived purely by the statistical functions of GQI. We prove the secret key rate formulas for a multiple access multicarrier CVQKD via the AMQD-MQA (multiuser quadrature allocation) scheme. The framework can be established in an arbitrary CVQKD protocol and measurement setting, and are implementable by standard low-complexity statistical functions, which is particularly convenient for an experimental CVQKD scenario.
L. Gyongyosi, S. Imre. Eigenchannel Decomposition for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Advances in Photonics of Quantum Computing, Memory, and Communication VIII, DOI: 10.1117/12.2076532, 2015.
We develop a singular layer transmission model for continuous-variable quantum key distribution (CVQKD). In CVQKD, the transmit information is carried by continuous-variable (CV) quantum states, particularly by Gaussian random distributed position and momentum quadratures. The reliable transmission of the quadrature components over a noisy link is a cornerstone of CVQKD protocols. The proposed singular layer uses the singular value decomposition of the Gaussian quantum channel, which yields an additional degree of freedom for the phase space transmission. This additional degree of freedom can further be exploited in a multiple-access scenario. The singular layer defines the eigenchannels of the Gaussian physical link, which can be used for the simultaneous reliable transmission of multiple user data streams. We demonstrate the results through the adaptive multicarrier quadrature division-multiuser quadrature allocation (AMQD-MQA) CVQKD multiple-access scheme. We define the singular model of AMQD-MQA and characterize the properties of the eigenchannel interference. The singular layer transmission provides improved simultaneous transmission rates for the users with unconditional security in a multiple-access scenario, particularly in crucial low signal-to-noise ratio regimes.
L. Gyongyosi. A Statistical Model of Information Evaporation of Perfectly Reflecting Black Holes, International Journal of Quantum Information (IJQI), ISSN 0219-7499, 1793-6918, DOI: 10.1142/S0219749915600254, 2014.
We provide a statistical communication model for the phenomenon of quantum information evaporation from black holes (BHs). A BH behaves as a reflecting quantum channel in a very special regime, which allows for a receiver to perfectly recover the absorbed quantum information. The quantum channel of a perfectly reflecting (PR) BH is the probabilistically weighted sum of infinitely many qubit cloning channels. In this work, we reveal the statistical communication background of the information evaporation process of PR BHs. We show that the density of the cloned quantum particles in function of the PR BH's mass approximates a Chi-square distribution, while the stimulated emission process is characterized by zero-mean, circular symmetric complex Gaussian random variables. The results lead to the existence of Rayleigh random distributed coefficients in the probability density evolution, which confirms the presence of Rayleigh fading (a special type of random fluctuation) in the statistical communication model of BH information evaporation.
International Journal of Quantum Information, Vol. 12, No. 07n08, 1560025, DOI: 10.1142/S0219749915600254, 2014.
L. Gyongyosi, S. Imre. Geometrical Analysis of Physically Allowed Quantum Cloning Transformations for Quantum Cryptography, Information Sciences, Elsevier, ISSN: 0020-0255; http://dx.doi.org/10.1016/j.ins.2014.07.010, 2014.
The security of quantum key distribution (QKD) relies on the no-cloning theorem, which allows no to copy perfectly a quantum system. An eavesdropping activity on the quantum channel perturbs the state of the quantum states, which results in noise at the receiver. The physical layer detection of the eavesdropping activity of the quantum channel requires tomography, which is intractable in experiment. An adequate and equivalent answer for the problem can be proposed through the logical layer. We propose an efficient algorithmical tool to study the eavesdropping activity on the quantum channel and characterize the properties of a quantum cloning-based attack for DV and CVQKD protocols. The physically allowed quantum cloning transformations on a quantum system can be described in terms of information geometry. We propose a computational geometrical method to analyze the cloning activity on the quantum channel and to characterize the noise properties. The security analysis studies the DV (discrete variable) and CV (continuous variable) QKD schemes through the four-state (BB84) and six-state DVQKD protocols and the two-way CVQKD protocol. The proposed geometrical method provides a useful tool to analyze the most powerful attacks against quantum cryptography and the effects of the physically allowed quantum cloning transformations.
S. Imre, L. Gyongyosi. Advanced Quantum Communications - An Engineering Approach, Publisher: Wiley-IEEE Press (New Jersey, USA), John Wiley & Sons, Inc., The Institute of Electrical and Electronics Engineers, ISBN-10: 1118002369, ISBN-13: 978-11180023, 488 pages, 2013.
In this book, we present the fundamental results of quantum information theory and the details of advanced quantum communication protocols with clear mathematical and information theoretical background.
Advanced Quantum Communications - An Engineering Approach, Publisher: Wiley-IEEE Press (New Jersey, USA), John Wiley and Sons, Inc., The Institute of Electrical and Electronics Engineers, ISBN-10: 1118002369, ISBN-13: 978-11180023, 488 pages, Hardcover, 2013.
L. Gyongyosi. The Correlation Conversion Property of Quantum Channels, Quantum Information Processing, Springer, ISSN: 1570-0755, ISSN: 1573-1332, DOI: 10.1007/s11128-013-0663-0, 2013.
Transmission of quantum entanglement will play a crucial role in future networks and long-distance quantum communications. Quantum Key Distribution, the working mechanism of quantum repeaters and the various quantum communication protocols are all based on quantum entanglement. On the other hand, quantum entanglement is extremely fragile and sensitive to the noise of the communication channel over which it has been transmitted. To share entanglement between distant points, high fidelity quantum channels are needed. In practice, these communication links are noisy, which makes it impossible or extremely difficult and expensive to distribute entanglement. In this work we first show that quantum entanglement can be generated by a new idea, exploiting the most natural effect of the communication channels: the noise itself of the link. We prove that the noise transformation of quantum channels that are not able to transmit quantum entanglement can be used to generate distillable (useable) entanglement from classically correlated input. We call this new phenomenon the Correlation Conversion property (CC-property) of quantum channels. The proposed solution does not require any non-local operation or local measurement by the parties, only the use of standard quantum channels.
L. Gyongyosi, S. Imre. Superactivation of Quantum Channels is Limited by the Quantum Relative Entropy Function, Quantum Information Processing, Springer, ISSN: 1570-0755, ISSN: 1573-1332, DOI: 10.1007/s11128-012-0446-z, 2012.
In this work we prove that the possibility of superactivation of quantum channel capacities is determined by the mathematical properties of the quantum relative entropy function. Before our work this fundamental and purely mathematical connection between the quantum relative entropy function and the superactivation effect was completely unrevealed. We demonstrate the results for the quantum capacity; however the proposed theorems and connections hold for all other channel capacities of quantum channels for which the superactivation is possible.
L. Gyongyosi, S. Imre. Algorithmic Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Quantum Channels, Information Sciences, Elsevier, ISSN: 0020-0255; DOI: 10.1016/j.ins.2012.08.008, 2012.
The superactivation of zero-capacity quantum channels makes it possible to use two zero-capacity quantum channels with a positive joint capacity for their output. Currently, we have no theoretical background to describe all possible combinations of superactive zero-capacity channels; hence, there may be many other possible combinations. In practice, to discover such superactive zero-capacity channel-pairs, we must analyze an extremely large set of possible quantum states, channel models, and channel probabilities. There is still no extremely efficient algorithmic tool for this purpose. This paper shows an efficient algorithmical method of finding such combinations. Our method can be a very valuable tool for improving the results of fault-tolerant quantum computation and possible communication techniques over very noisy quantum channels.
L. Gyongyosi, with S. Imre et al. Quantum-assisted and Quantum-based Solutions in Wireless Systems, in: ,,Wireless Myths, Realities and Futures: From 3G/4G to Optical and Quantum Wireless'', Proceedings of the IEEE, 100th Year Anniversary Celebration Volume of the Proceedings of the IEEE, ISSN: 0018-9219, DOI: 10.1109/JPROC.2012.2189788, 2012.
In wireless systems there is always a trade-off between reducing the transmit power and mitigating the resultant signal-degradation imposed by the transmit-power reduction with the aid of sophisticated receiver algorithms, when considering the total energy consumption. Quantum-assisted wireless communications exploits the extra computing power offered by quantum mechanics based architectures. This paper summarizes some recent results in quantum computing and the corresponding application areas in wireless communications.
L. Gyongyosi, S. Imre. Quantum Singular Value Decomposition Based Approximation Algorithm, Journal of Circuits, Systems, and Computers (JCSC), World Scientific, DOI: 10.1142/S0218126610006797; 2010.
Singular Value Decomposition (SVD) is one of the most useful techniques for analyzing data in linear algebra. SVD decomposes a rectangular real or complex matrix into two orthogonal matrices and one diagonal matrix. The proposed Quantum-SVD algorithm interpolates the non-uniform angles in the Fourier domain. The error of the Quantum-SVD approach is some orders lower than the error given by ordinary Quantum Fourier Transformation. Our Quantum-SVD algorithm is a fundamentally novel approach for the computation of the Quantum Fourier Transformation (QFT) of non-uniform states. The presented Quantum-SVD algorithm is based on the singular value decomposition mechanism, and the computation of Quantum Fourier Transformation of non-uniform angles of a quantum system. The Quantum-SVD approach provides advantages in terms of computational structure, being based on QFT and multiplications.
Journal Papers
L. Gyongyosi. Adaptive Problem Solving Dynamics in Gate-Model Quantum Computers, Entropy, DOI: 10.3390/e24091196, 2022.
L. Gyongyosi, S. Imre. Subchannel Estimation and Subcarrier Detection for Multiuser Multicarrier Continuous-Variable Quantum Key Distribution, Quantum Eng., 2022.
L. Gyongyosi. Approximation Method for Optimization Problems in Gate-Model Quantum Computers, Chaos, Solitons & Fractals, DOI: 10.1016/j.csfx.2021.100066, 2021.
L. Gyongyosi, S. Imre. Advances in the Quantum Internet, Communications of the ACM, DOI: 10.1145/3524455, 2022.
L. Gyongyosi. Post-Processing Optimization for Continuous-Variable Quantum Key Distribution, Theoretical Computer Science, DOI: 10.1016/j.tcs.2021.08.023, 2021.
L. Gyongyosi, S. Imre. Scalable Distributed Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-76728-5, www.nature.com/articles/s41598-020-76728-5, 2021.
L. Gyongyosi, S. Imre. Resource Prioritization and Balancing for the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-78960-5, www.nature.com/articles/s41598-020-78960-5, 2020.
L. Gyongyosi. Energy Transfer and Thermodynamics of Quantum Gravity Computation, Chaos, Solitons & Fractals, DOI: 10.1016/j.csfx.2020.100050, 2020.
L. Gyongyosi. Dynamics of Entangled Networks of the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-68498-x, www.nature.com/articles/s41598-020-68498-x, 2020.
L. Gyongyosi. Decoherence Dynamics Estimation for Superconducting Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-020-02863-7, 2020.
L. Gyongyosi, S. Imre. Routing Space Exploration for Scalable Routing in the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-68354-y, www.nature.com/articles/s41598-020-68354-y, 2020.
L. Gyongyosi. Objective Function Estimation for Solving Optimization Problems in Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-71007-9, www.nature.com/articles/s41598-020-71007-9, 2020.
L. Gyongyosi, S. Imre. Entanglement Concentration Service for the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-020-02716-3, 2020.
L. Gyongyosi. Unsupervised Quantum Gate Control for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-67018-1, www.nature.com/articles/s41598-020-67018-1, 2020.
L. Gyongyosi, S. Imre. Circuit Depth Reduction for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-67014-5, www.nature.com/articles/s41598-020-67014-5, 2020.
L. Gyongyosi. Quantum State Optimization and Computational Pathway Evaluation for Gate-Model Quantum Computers, Scientific Reports, Nature, DOI: 10.1038/s41598-020-61316-4, www.nature.com/articles/s41598-020-61316-4, 2020.
L. Gyongyosi, S. Imre. Entanglement Accessibility Measures for the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-020-2605-y, 2020.
L. Gyongyosi, S. Imre. Theory of Noise-Scaled Stability Bounds and Entanglement Rate Maximization in the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-020-58200-6, www.nature.com/articles/s41598-020-58200-6, 2020.
L. Gyongyosi. Correlation Measure Equivalence in Dynamic Causal Structures of Quantum Gravity, Quantum Eng., Wiley, DOI: 10.1002/QUE2.30, 2019.
L. Gyongyosi. Order Statistics and Random Matrix Theory of Multicarrier Continuous-Variable Quantum Key Distribution, Int. J. Commun. Syst., Wiley, DOI:10.1002/dac.4314, 2019.
L. Gyongyosi, S. Imre. Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices, Scientific Reports, Nature, DOI: 10.1038/s41598-019-56689-0, www.nature.com/articles/s41598-019-56689-0, 2019.
L. Gyongyosi, S. Imre. Theory of Quantum Gravity Information Processing, Quantum Eng., Wiley, DOI: 10.1002/que2.23, 2019.
L. Gyongyosi, S. Imre. Subcarrier Domain of Multicarrier Continuous-Variable Quantum Key Distribution, J. Stat. Phys., Springer Nature, DOI: 10.1007/s10955-019-02404-2, 2019.
L. Gyongyosi, S. Imre. High-Retrieval Efficiency Quantum Memory for the Quantum Internet, SPIE Photonics West OPTO 2020 Proceedings, 2020.
L. Gyongyosi, S. Imre. Training Optimization for Gate-Model Quantum Neural Networks, Scientific Reports, Nature, DOI: 10.1038/s41598-019-48892-w, www.nature.com/articles/s41598-019-48892-w, 2019.
L. Gyongyosi, S. Imre. Secret Key Rate Adaption for Multicarrier Continuous-Variable Quantum Key Distribution, SN Comput. Sci., Springer Nature, DOI: 10.1007/s42979-019-0027-7, 2019.
L. Gyongyosi, S. Imre. State Stabilization for Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2397-0, 2019.
L. Gyongyosi, S. Imre. A Poisson Model for Entanglement Optimization in the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2335-1, 2019.
L. Gyongyosi, S. Imre. Statistical Quadrature Evolution by Inference for Multicarrier Continuous-Variable Quantum Key Distribution, Quantum Studies: Mathematics and Foundations, Springer Nature, DOI: 10.1007/s40509-019-00202-9, 2019.
L. Gyongyosi. Singular Value Decomposition Assisted Multicarrier Continuous-Variable Quantum Key Distribution, Theoretical Computer Science, Elsevier, DOI: 10.1016/j.tcs.2019.07.029, 2019.
L. Gyongyosi, S. Imre. Secret Key Rates of Free-Space Optical Continuous-Variable Quantum Key Distribution, Int. J. Commun. Syst., Wiley, DOI: 10.1002/dac.4152, 2019.
L. Gyongyosi, L. Bacsardi, S. Imre. A Survey on Quantum Key Distribution, Infocom. J., HTE, IEEE Communications Society, DOI: 10.36244/ICJ.2019.2.2, 2019.
L. Gyongyosi, S. Imre. Quantum Circuit Design for Objective Function Maximization in Gate-Model Quantum Computers, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2326-2, 2019.
L. Gyongyosi, S. Imre. Dense Quantum Measurement Theory, Scientific Reports, Nature, DOI: 10.1038/s41598-019-43250-2, www.nature.com/articles/s41598-019-43250-2, 2019.
L. Gyongyosi, S. Imre. Diversity Space of Multicarrier Continuous-Variable Quantum Key Distribution, Int. J. Commun. Syst., Wiley, DOI: 10.1002/dac.4003, 2019.
L. Gyongyosi, S. Imre. Entanglement Access Control for the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-019-2226-5, 2019.
L. Gyongyosi, S. Imre. Gaussian Quadrature Inference for Multicarrier Continuous-Variable Quantum Key Distribution, Quantum Studies: Mathematics and Foundations, Springer Nature, DOI: 10.1007/s40509-019-00183-9, 2019.
L. Gyongyosi, S. Imre. Opportunistic Entanglement Distribution for the Quantum Internet, Scientific Reports, Nature, DOI: 10.1038/s41598-019-38495-w, www.nature.com/articles/s41598-019-38495-w, 2019.
L. Gyongyosi, S. Imre. Adaptive Routing for Quantum Memory Failures in the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-018-2153-x, 2018.
L. Gyongyosi, S. Imre. Time Complexity Reduction for Gate-Model Quantum Computers, SPIE Quantum Information Science, Sensing, and Computation Proceedings, 2019.
L. Gyongyosi, S. Imre. A Survey on Quantum Computing Technology, Computer Science Review, Elsevier, DOI: 10.1016/j.cosrev.2018.11.002, ISSN: 1574-0137, 2018.
L. Gyongyosi, S. Imre. Secret Key Rate Proof of Multicarrier Continuous-Variable Quantum Key Distribution, Int. J. Commun. Syst., Wiley, DOI: 10.1002/dac.3865, 2018.
L. Gyongyosi, S. Imre. Reconciliation Optimization for Continuous-Variable Quantum Key Distribution, SPIE Photonics West OPTO 2019 Proceedings, 2019.
L. Gyongyosi, S. Imre. Topology Adaption for the Quantum Internet, Quantum Information Processing, Springer Nature, DOI: 10.1007/s11128-018-2064-x, 2018.
L. Gyongyosi, S. Imre. Multilayer Optimization for the Quantum Internet, Scientific Reports, Nature, DOI:10.1038/s41598-018-30957-x, www.nature.com/articles/s41598-018-30957-x, 2018.
L. Gyongyosi, S. Imre. Decentralized Base-Graph Routing for the Quantum Internet, Physical Review A, American Physical Society, DOI: 10.1103/PhysRevA.98.022310, https://link.aps.org/doi/10.1103/PhysRevA.98.022310, 2018.
L. Gyongyosi, S. Imre. Entanglement Availability Differentiation Service for the Quantum Internet, Scientific Reports, Nature, (DOI:10.1038/s41598-018-28801-3), www.nature.com/articles/s41598-018-28801-3, 2018.
L. Gyongyosi, S. Imre, H. V. Nguyen. A Survey on Quantum Channel Capacities, IEEE Communications Surveys and Tutorials, IEEE, DOI: 10.1109/COMST.2017.2786748, 2018.
L. Gyongyosi, S. Imre. Low-Dimensional Reconciliation for Continuous-Variable Quantum Key Distribution, Appl. Sci., (DOI: 10.3390/app8010087), ISSN 2076-3417, 2018.
L. Gyongyosi, S. Imre. A Poisson Model for Entanglement Optimization in the Quantum Internet, SPIE Quantum Information Science, Sensing, and Computation Proceedings, 2018.
L. Gyongyosi, S. Imre. Dynamic Topology Resilience for Quantum Networks, SPIE Photonics West OPTO 2018 Proceedings, 2018.
L. Gyongyosi, S. Imre. Entanglement-Gradient Routing for Quantum Networks, Scientific Reports, Nature, (DOI:10.1038/s41598-017-14394-w), www.nature.com/articles/s41598-017-14394-w, 2017.
L. Gyongyosi. Quantum Imaging of High-Dimensional Hilbert Spaces with Radon Transform, International Journal of Circuit Theory and Applications (IJCTA), Special Issue on Quantum Circuits (Wiley), 2017.
L. Gyongyosi, with S. Imre, A. Mraz, Zs. Kis, L. Bacsardi. Quantum Circuit-based Modeling of Continuous-Variable Quantum Key Distribution System, International Journal of Circuit Theory and Applications (IJCTA), Special Issue on Quantum Circuits (Wiley), 2017.
L. Gyongyosi, S. Imre. Statistical Quadrature Evolution by Inference for Continuous-Variable Quantum Key Distribution, SPIE Photonics West OPTO 2017 Proceedings, "Advances in Photonics of Quantum Computing, Memory, and Communication X", 2016.
L. Gyongyosi, S. Imre. Gaussian Quadrature Inference for Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation IX, 2016.
L. Gyongyosi, S. Imre. Adaptive Gaussian Quadrature Detection for Continuous-Variable Quantum Key Distribution, SPIE Photonics West OPTO 2016 Proceedings, "Advances in Photonics of Quantum Computing, Memory, and Communication IX", 2015.
L. Gyongyosi. A Statistical Model of Information Evaporation of Perfectly Reflecting Black Holes, International Journal of Quantum Information (IJQI), ISSN 0219-7499 (print), 1793-6918 (online), 2014.
L. Gyongyosi, S. Imre. Multidimensional Manifold Extraction for Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation XIII, 2015.
L. Gyongyosi. The Private Classical Capacity of a Partially Degradable Quantum Channel, Physica Scripta, Special Issue on Quantum Information, Institute of Physics (IOP), Online ISSN: 1402-4896 Print ISSN: 0031-8949, 2014.
L. Gyongyosi, S. Imre. Eigenchannel Decomposition for Continuous-Variable Quantum Key Distribution, SPIE Photonics West OPTO 2015 Proceedings, "Advances in Photonics of Quantum Computing, Memory, and Communication VIII", 2015.
L. Gyongyosi. The Structure and Quantum Capacity of a Partially Degradable Quantum Channel, IEEE Access, ISSN: 2169-3536, 2014.
L. Gyongyosi, S. Imre. Geometrical Analysis of Physically Allowed Quantum Cloning Transformations for Quantum Cryptography, Information Sciences, ISSN: 0020-0255; 2014.
L. Gyongyosi. Quantum Information Transmission over a Partially Degradable Channel, IEEE Access, ISSN: 2169-3536, 2014.
L. Gyongyosi. The Correlation Conversion Property of Quantum Channels, Quantum Information Processing, Springer, ISSN: 1570-0755 (print version), ISSN: 1573-1332 (electronic version), 2013.
L. Gyongyosi, S. Imre. Adaptive Multicarrier Quadrature Division Modulation for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation XII, 2014.
L. Gyongyosi, S. Imre. Long-distance Continuous-Variable Quantum Key Distribution with Advanced Reconciliation of a Gaussian Modulation, Proceedings of SPIE Photonics West OPTO 2013, "Advances in Photonics of Quantum Computing, Memory, and Communication VII", 2014.
L. Gyongyosi, S. Imre. Distillable Entanglement from Classical Correlation, Proceedings of SPIE Quantum Information and Computation XI, 2013.
L. Gyongyosi, S. Imre. Opening of Hidden Capacity-Domains of Quantum Channels, Proceedings of SPIE Photonics West OPTO 2013, "Advances in Photonics of Quantum Computing, Memory, and Communication VI", 2013.
L. Gyongyosi, S. Imre. Polaractivation for Classical Zero-Error Capacity of Qudit Channels, American Institute of Physics (AIP) Proceedings, Quantum Communication, Measurement and Computing (QCMC 2012), 2013.
L. Gyongyosi, S. Imre. Reliable Quantum Communication over a Quantum Relay Channel, American Institute of Physics (AIP) Proceedings, Quantum Communication, Measurement and Computing (QCMC 2012), 2013.
L. Gyongyosi, S. Imre. Quasi-Superactivation for the Classical Capacity of Quantum Channels, American Institute of Physics (AIP) Proceedings,Quantum Communication, Measurement and Computing (QCMC 2012), 2013.
L. Gyongyosi, S. Imre. Superactivation of Quantum Channels is Limited by the Quantum Relative Entropy Function, Quantum Information Processing, Springer, ISSN: 1570-0755 (print version), ISSN: 1573-1332 (electronic version), 2012.
L. Gyongyosi, S. Imre. Quasi-Superactivation of Classical Capacity of Zero-Capacity Quantum Channels, Journal of Modern Optics, Taylor & Francis, 0950-0340 (Print), 1362-3044 (Online), 2012.
L. Gyongyosi, S. Imre. Private Quantum Coding for Quantum Relay Networks, Lecture Notes in Computer Science, Vol. 7479, pp. 239-250. Springer Verlag, 2012.
L. Gyongyosi, S. Imre. Quantum Communication with Optical Channels, Proceedings of the IEEE, ISSN: 0018-9219. (in prep.)
L. Gyongyosi, S. Imre. Polaractivation of Private Capacity-Domain of Non-Private Quantum Channels, American Institute of Physics (AIP) Proceedings, Quantum Theory: Reconsideration of Foundations 6, USA, 2012.
L. Gyongyosi, S. Imre. Mathematical Limit in the Superactivation of Zero-Capacity Quantum Channels, American Institute of Physics (AIP) Proceedings, Quantum Theory: Reconsideration of Foundations 6, USA, 2012.
L. Gyongyosi, S. Imre. Classical Communication over Zero-Capacity Quantum Channels, American Institute of Physics (AIP) Proceedings, Quantum Theory: Reconsideration of Foundations 6, USA, 2012.
S. Imre, L. Gyongyosi. Introduction to Quantum-assisted and Quantum-based Solutions, with Lajos Hanzo, Harald Haas, Dominic O’Brien and Markus Rupp, in "Prolog to the Section on Wireless Communications Technology", Proceedings of the IEEE, Volume: 100, Issue: Special Centennial Issue, ISSN: 0018-9219, 2012.
S. Imre, L. Gyongyosi. Quantum-assisted and Quantum-based Solutions in Wireless Systems, with Lajos Hanzo, Harald Haas, Dominic O’Brien and Markus Rupp, in: "Wireless Myths, Realities and Futures: From 3G/4G to Optical and Quantum Wireless", Proceedings of the IEEE, Volume: 100, Issue: Special Centennial Issue, ISSN: 0018-9219, 2012.
L. Gyongyosi, S. Imre. Long-Distance Quantum Communications with Superactivated Gaussian Optical Quantum Channels, SPIE Optical Engineering, ISSN: 0091-3286, E-ISSN: 1560-2303; USA, 2011.
L. Gyongyosi, S. Imre. Information Geometric Superactivation of Classical Zero-Error Capacity of Quantum Channels, Progress in Informatics, Quantum Information Technology, Quantum Information Science Theory Group, National Institute of Informatics, Tokyo, Japan, Print ISSN : 1349-8614, Online ISSN : 1349-8606; 2011.
L. Gyongyosi, S. Imre. Algorithmic Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Quantum Channels, Information Sciences, Elsevier, ISSN: 0020-0255; 2011.
L. Gyongyosi, S. Imre. Capacity Recovery of Very Noisy Optical Quantum Channels, International Journal of Applied Mathematics and Informatics, University Press, ISSN: 2074-1278, United Kingdom; 2011.
L. Gyongyosi, S. Imre. Information Geometrical Analysis of Additivity of Optical Quantum Channels, IEEE/OSA Journal of Optical Communications and Networking (JOCN), IEEE Photonics Society & Optical Society of America, ISSN: 1943-0620; 2010.
L. Gyongyosi, S. Imre. Algorithmical Analysis of Information-Theoretic Aspects of Secure Communication over Optical-Fiber Quantum Channels, Journal of Optical and Fiber Communications Research, Springer New York, ISSN 1867-3007 (Print) 1619-8638 (Online); 2010.
L. Gyongyosi, S. Imre. Information Geometric Security Analysis of Differential Phase Shift Quantum Key Distribution Protocol, Security and Communication Networks, John Wiley & Sons, Ltd. ISSN: 1939-0114; 2010.
L. Gyongyosi, S. Imre. Novel Quantum Information Solution to Copy-Protection and Secured Authentication, International Journal of Internet Technology and Secured Transactions (IJITST), ISSN (Online): 1748-5703, ISSN (Print): 1748-569X; 2011.
L. Gyongyosi, S. Imre. Informational Geometric Analysis of Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Optical Quantum Channels, Proceedings of SPIE Photonics West OPTO 2011, ISBN: 9780819484857, Vol: 7948, 2011.
L. Gyongyosi, S. Imre. Information Geometric Solution to Additivity of Amplitude-Damping Quantum Channel, AIP Conference Proceedings of QCMC 2010, American Institute of Physics, AIP Conference Proceedings Series (Library of Congress), 2011.
L. Gyongyosi, S. Imre. Quantum Informational Divergence in Quantum Channel Security Analysis, International Journal of Network Security, ISSN 1816-353X, ISSN 1816-3548; 2011.
L. Gyongyosi, S. Imre. Efficient Computational Information Geometric Analysis of Physically Allowed Quantum Cloning Attacks for Quantum Key Distribution Protocols, Transactions on Communications (WS), ISSN: 1109-2742; 2010.
L. Gyongyosi, S. Imre. Information Geometrical Approximation of Quantum Channel Security, International Journal On Advances in Security, Published by: International Academy, Research and Industry Association, ISSN: 1942-2636; 2010.
L. Gyongyosi, S. Imre. Geometrical Estimation of Information Theoretical Impacts of Incoherent Attacks for Quantum Cryptography, Int. Rev. of Physics, Print ISSN: 1971 - 680X; 2010.
L. Gyongyosi, S. Imre. Quantum Singular Value Decomposition Based Approximation Algorithm, Journal of Circuits, Systems, and Computers (JCSC), World Scientific, Print ISSN: 0218-1266, Online ISSN: 1793-6454; 2010.
L. Gyongyosi, S. Imre. Quantum Information Theoretical Based Geometrical Representation of Eavesdropping Activity on the Quantum Channel, Infocommunications Journal, Scientific Association for Infocommunications, ISSN 0018-2028; 2010.
L. Gyongyosi, S. Imre. Quantum Protected Software, International Review on Computers and Software, ISSN:1828-6003, 1828-6011; 2009.
L. Gyongyosi, S. Imre. Quantum cryptography based info-communication systems, Infocommunications Journal, Scientific Association for Infocommunications, BME, Faculty of Electrical Engineering and Informatics, Department of Telecommunications, 2008. ISSN 0018-2028; Pollak-Virag Best Paper Award 2009, Scientific Association For Infocommunication, Hungary.
L. Gyongyosi. Quantum information in data privacy, Alma Mater series, Studies on Information and Knowledge Processes: Open Data, Protected Data 2, pages 341-378., BME, Faculty of Economic and Social Sciences, ISSN 1587-2386, ISBN 798-963-87788-5-7; 2008.
S. Szabo, L. Gyongyosi, S. Imre. Performance Evaluation of Anycast-Based Micro-mobility Management, Int. J. of Mobile Network Design and Innovation (IJMNDI), 2008.
L. Gyongyosi. TOR and Torpark: Functional and performance analyses of new generation anonymous browsers, Alma Mater series, Studies on Information and Knowledge Processes 11, pages 159-191., BME, Faculty of Economic and Social Sciences, ISSN 1587-2386, ISBN-10 963-421-429-0, ISBN-13 987-963-421-429-8. Published on-line: Hungarian privacy Enhancing Technologies portal, 2007.
Books
S. Imre, L. Gyongyosi. Advanced Quantum Communications - An Engineering Approach, Publisher: Wiley-IEEE Press (New Jersey, USA), John Wiley & Sons, Inc., The Institute of Electrical and Electronics Engineers, ISBN-10: 1118002369, ISBN-13: 978-11180023, 488 pages, 2013.
Advanced Quantum Communications - An Engineering Approach, Publisher: Wiley-IEEE Press (New Jersey, USA), John Wiley and Sons, Inc., The Institute of Electrical and Electronics Engineers, ISBN-10: 1118002369, ISBN-13: 978-11180023, 488 pages, Hardcover, 2013.
L. Gyongyosi, S. Imre. Quantum Mechanics based Communications, Research University series, Budapest University of Technology and Economics, 2012.
Book Chapters
L. Gyongyosi. Algorithmic Superactivation of Zero-Capacity Quantum Channels, Printed book version of my PhD Dissertation, available at Amazon.com, 2013. ISBN-13: 978-3-659-18584-7
L. Gyongyosi, S. Imre. Quantum Cryptographic Protocols and Quantum Security, in Cryptography: Protocols, Design and Applications, Nova Science Publishers, (New York, USA), 2012.
L. Gyongyosi, S. Imre. Secure Long-Distance Quantum Communication over Noisy Optical Fiber Quantum Channels, in Optical Fibers, Intech, ISBN 978-953-307-922-6; 2011.
L. Gyongyosi, S. Imre. Quantum Cellular Automata Controlled Self-Organizing Networks, in Cellular Automata, Intech, ISBN 978-953-7619-X-X; 2010.
L. Bacsardi, L. Gyongyosi, M. Berces, S. Imre. Quantum Solutions for Future Space Communication, in Quantum Computers, Nova Science Publishers, 2010.
S. Szabo, L. Gyongyosi, K. Lendvai, S. Imre. Overview of IP Multimedia Subsystem Protocols and Communication Services, in Advanced Communication Protocol Technologies: Solutions, Methods and Applications, 2010.
Conference Papers
L. Gyongyosi, S. Imre. Opportunistic Entanglement Distribution for the Quantum Internet, Proceedings of Quantum Computing, Communication, and Simulation III, SPIE OPTO 2023, San Francisco, California, USA, January 28-Feb 2, 2023.
L. Gyongyosi, S. Imre. Scalable Distributed Gate-Model Quantum Computers, Bulletin of the American Physical Society, APS March Meeting 2022, Session on Scalable Quantum Computing Architectures, Chicago, USA, March 14-18, 2022.
L. Gyongyosi, S. Imre. Problem Solving Dynamics for Gate-Model Quantum Computers, Proceedings of SPIE Quantum Information Science, Sensing, and Computation XIV, Orlando, Florida, USA, April 3-7, 2022.
L. Gyongyosi, S. Imre. Resource Optimization for the Quantum Internet, Proceedings of Quantum Computing, Communication, and Simulation II, SPIE OPTO 2022, San Francisco, California, USA, January 22-27, 2022.
L. Gyongyosi, S. Imre. Distributed Quantum Computation for Near-Term Quantum Environments, Proceedings of SPIE Quantum Information Science, Sensing, and Computation XIII, Orlando, Florida, USA, April 11-15, 2021.
L. Gyongyosi, S. Imre. Entangled Network Dynamics of the Quantum Internet, Proceedings of Advanced Optical Techniques for Quantum Information, Sensing, and Metrology, SPIE OPTO 2021, San Francisco, California, USA, March 6-11, 2021.
L. Gyongyosi, S. Imre. Scalable Distributed Gate-Model Quantum Computers, Proceedings of the Frontiers in Optics 2020 (FiO 2020), Optical Society of America (OSA), Washington, D.C., USA, September 14-17, 2020.
L. Gyongyosi, S. Imre. Quantifying the Dynamics of Entangled Networks of the Quantum Internet, Proceedings of the Frontiers in Optics 2020 (FiO 2020), Optical Society of America (OSA), Washington, D.C., USA, September 14-17, 2020.
L. Gyongyosi, S. Imre. Quantum Memory Optimization with Quantum Machine Learning for Quantum Secure Direct Communication, Proceedings of the 10th International Conference on Quantum Cryptography (QCrypt 2020), Amsterdam, Netherlands, August 10-14, 2020.
L. Gyongyosi, S. Imre. Training Optimization for Gate-Model Quantum Neural Networks, Bulletin of the American Physical Society, APS DAMOP 2020, 51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Session on Quantum Computation: Gates, Algorithms, and Architectures, Portland, Oregon, USA, June 1-5, 2020.
L. Gyongyosi, S. Imre. Objective Function Maximization by Machine Learning for Gate-Model Quantum Computers, Proceedings of Quantum Information Science, Sensing, and Computation XII, SPIE Defense, Anaheim, California, USA, April 26-30, 2020.
L. Gyongyosi, S. Imre. Time Complexity Reduction for Gate-Model Quantum Computers, Bulletin of the American Physical Society, APS March Meeting 2020, Session on General Quantum Algorithms, Denver, Colorado, USA, March 2-6, 2020.
L. Gyongyosi, S. Imre. High-Retrieval Efficiency Quantum Memory for the Quantum Internet, Proceedings of Advanced Optical Techniques for Quantum Information, Sensing, and Metrology, SPIE OPTO 2020, San Francisco, California, USA, February 1-6, 2020.
L. Gyongyosi, S. Imre. Training Optimization for Gate-Model Quantum Neural Networks, Proceedings of Quantum Information Processing 2020 (QIP 2020), Shenzhen, China, January 6-10, 2020.
L. Gyongyosi, S. Imre. Dense Quantum Measurement Theory, Proceedings of Quantum Information Processing 2020 (QIP 2020), Shenzhen, China, January 6-10, 2020.
L. Gyongyosi, S. Imre. Resource Prioritization and Resource Balancing for the Quantum Internet, Proceedings of the Frontiers in Optics 2019 (FiO 2019), Optical Society of America (OSA), Washington, D.C., USA, September 15-19, 2019.
L. Gyongyosi, S. Imre. Measurement Optimization for Gate-Model Quantum Computers, Proceedings of the Frontiers in Optics 2019 (FiO 2019), Optical Society of America (OSA), Washington, D.C., USA, September 15-19, 2019.
L. Gyongyosi, S. Imre. Secret Key Reconciliation for Long-Distance Quantum Key Distribution with Discrete and Continuous Variables, Proceedings of the 9th International Conference on Quantum Cryptography (QCrypt 2019), Montreal, Canada, August 26-30, 2019.
L. Gyongyosi, S. Imre. Optimization of Objective Function Estimation for Gate-Model Quantum Computers, Bulletin of the American Physical Society, APS DAMOP 2019, 50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Session on Quantum Simulation and Algorithms, Milwaukee, Wisconsin, USA, May 27-31, 2019.
L. Gyongyosi, S. Imre. Dense Measurements for Gate-Model Quantum Computers, Bulletin of the American Physical Society, APS March Meeting 2019, Session on General Quantum Information and Quantum Computation, Boston, Massachusetts, USA, March 4-8, 2019.
L. Gyongyosi, S. Imre. Time Complexity Reduction for Gate-Model Quantum Computers, Proceedings of SPIE Quantum Information Science, Sensing, and Computation XI, Baltimore, Maryland, USA, April 14-18, 2019.
L. Gyongyosi, S. Imre. Dense Measurements for Quantum Computations, Proceedings of Quantum Information and Measurement (QIM) V: Quantum Technologies, OSA (The Optical Society of America), University of Rome La Sapienza, Rome, Italy, April 4-6, 2019.
L. Gyongyosi, S. Imre. A Universal Quantum Algorithm for Time Complexity Reduction of Quantum Computers, Proceedings of Quantum Information Processing 2019 (QIP 2019), University of Colorado Boulder, USA, January 14-18, 2019.
L. Gyongyosi, S. Imre. Improved Reconciliation for Continuous-Variable Quantum Key Distribution, Proceedings of Advances in Photonics of Quantum Computing, Memory, and Communication XII, SPIE OPTO 2019, San Francisco, California, USA, February 2-7, 2019.
L. Gyongyosi, S. Imre. Problem Solving Optimization by Machine Learning for Gate-Model Quantum Computers, Proceedings of Quantum Techniques in Machine Learning (QTML2018), Durban, South Africa, November 12-16, 2018.
L. Gyongyosi, S. Imre. Unsupervised Machine Learning Control of Quantum Gates in Gate-Model Quantum Computers, Proceedings of the Frontiers in Optics 2018 (FiO 2018), Optical Society of America (OSA), Washington, D.C., USA, September 16-20, 2018.
L. Gyongyosi, S. Imre. Entanglement Concentration Service for the Quantum Internet, Proceedings of the Frontiers in Optics 2018 (FiO 2018), Optical Society of America (OSA), Washington, D.C., USA, September 16-20, 2018.
L. Gyongyosi, S. Imre. Post-Processing Optimization for Continuous-Variable Quantum Key Distribution, Proceedings of QCrypt 2018, 8th International Conference on Quantum Cryptography, Shanghai, China, August 27-31, 2018.
L. Gyongyosi, S. Imre. Layout Generation with Decoherence Estimation for Gate-Model Quantum Computer Architectures, Bulletin of the American Physical Society, APS DAMOP 2018, 49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting, Session on Quantum Information Science, Ft. Lauderdale, Florida, USA, May 28-June 1, 2018.
L. Gyongyosi. Quantum Circuit Design Automation for Quantum Computers, Proceedings of the 2018 International Conference on Quantum Communication, Measurement and Computing (QCMC 2018), Louisiana State University, Baton Rouge, USA, March 12-16, 2018.
L. Gyongyosi, S. Imre. A Poisson Model for Entanglement Optimization in the Quantum Internet, Proceedings of SPIE Quantum Information Science, Sensing, and Computation X, Orlando, Florida, USA, April 15-19, 2018.
L. Gyongyosi, S. Imre. Quantum Circuit Designs for Gate Model Quantum Computers, Bulletin of the American Physical Society, APS March Meeting 2018, APS Division of Quantum Information (DQI) Session, Los Angeles, California, USA, March 5-9, 2018.
L. Gyongyosi, S. Imre. Dynamic Topology Resilience for Quantum Networks, Proceedings of Advances in Photonics of Quantum Computing, Memory, and Communication XI, SPIE OPTO 2018, San Francisco, California, USA, January 27-February 1, 2018.
L. Gyongyosi. Entanglement Distribution and Routing in Quantum Communication Networks, Proceedings of Quantum Summit 2017, Chengdu, China, October 11-17, 2017.
L. Gyongyosi. Efficient Decentralized Routing in Quantum Networks, Proceedings of QCrypt 2017, 7th International Conference on Quantum Cryptography, University of Cambridge, Cambridge, United Kingdom, September 18-22, 2017.
L. Gyongyosi. Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of QCrypt 2017, 7th International Conference on Quantum Cryptography, University of Cambridge, Cambridge, United Kingdom, September 18-22, 2017.
L. Gyongyosi, S. Imre. Hamiltonian Dynamics for Entanglement Distribution in Quantum Networks, SPIE Quantum Communications and Quantum Imaging XV, San Diego, California, USA, August 6-10, 2017.
L. Gyongyosi, S. Imre. Decentralized Routing and Diameter Bounds in Entangled Quantum Networks, Proceedings of APS DAMOP 2017, 48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Session on Quantum Networks and Photon Sources, Bulletin of the American Physical Society, The American Physical Society, Sacramento, California, USA, June 5-9, 2017.
L. Gyongyosi, S. Imre. Fast Entanglement Establishment via Local Dynamics for Quantum Repeater Networks, Proceedings of the APS March Meeting 2017, Session on Entanglement in Open Quantum Systems, Bulletin of the American Physical Society, The American Physical Society, New Orleans, Louisiana, USA, March 13-17, 2017.
L. Gyongyosi, S. Imre. Statistical Quadrature Evolution by Inference for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Photonics West OPTO 2017, "Advances in Photonics of Quantum Computing, Memory, and Communication X", San Francisco, California, USA, January 28-February 2, 2017.
L. Gyongyosi, S. Imre. Statistical Quadrature Evolution for Continuous-Variable Quantum Key Distribution, Proceedings of APS DAMOP 2016, 47th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, Section on Quantum Information Theory, Bulletin of the American Physical Society, The American Physical Society, Volume 61, Number 7, Providence, Rhode Island, USA, May 23-27, 2016.
L. Gyongyosi. Diversity Extraction for Multicarrier Continuous-Variable Quantum Key Distribution, IEEE Signal Processing Conference Proceedings, 2016 24th European Signal Processing Conference (EUSIPCO 2016), Section on Quantum Communications, Budapest, August 29-September 2, 2016.
L. Gyongyosi, with Albert Mraz, S. Imre. Performance Evaluation of Scalar Reconciliation for Continuous-Variable Quantum Key Distribution, IEEE Signal Processing Conference Proceedings, 2016 24th European Signal Processing Conference (EUSIPCO 2016), Section on Quantum Communications, Budapest, August 29-September 2, 2016.
L. Gyongyosi, S. Imre. Gaussian Quadrature Inference for Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation IX, Baltimore, Maryland, USA, April 17-21, 2016.
L. Gyongyosi, S. Imre. Adaptive Gaussian Quadrature Detection for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Photonics West OPTO 2016, "Advances in Photonics of Quantum Computing, Memory, and Communication IX", San Francisco, California, USA, February 13-18, 2016.
L. Gyongyosi. Entropy Transfer of Quantum Gravity Information Processing, Proceedings of APS DAMOP 2015, 46th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, Bulletin of the American Physical Society, The American Physical Society, Volume 60, Number 7, Columbus, Ohio, USA, June 8-12, 2015.
L. Gyongyosi, S. Imre. Multidimensional Manifold Extraction for Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation XIII, Baltimore, Maryland, USA, April 20-24, 2015.
L. Gyongyosi, S. Imre. Adaptive Quadrature Detection for Multicarrier Continuous-Variable Quantum Key Distribution, Proceedings of the APS March Meeting 2015, Session on Quantum Foundations and Technologies, Bulletin of the American Physical Society, San Antonio, Texas, USA, March 2-6, 2015.
L. Gyongyosi, S. Imre. Eigenchannel Decomposition for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Photonics West OPTO 2015, "Advances in Photonics of Quantum Computing, Memory, and Communication VIII", San Francisco, California, USA, February 7-12, 2015.
L. Gyongyosi, Singular Layer Transmission for Continuous-Variable Quantum Key Distribution, Proceedings of the 2014 IEEE Photonics Conference, San Diego, California USA, October 12-16, 2014.
L. Gyongyosi, S. Imre. Quantum Imaging of High-Dimensional Hilbert Spaces with Radon Transform, Proceedings of 2014 Frontiers in Optics/Laser Science XXX (FiO/LS), Tucson, Arizona, USA, October 19-23, 2014.
L. Gyongyosi, S. Imre. Information Processing with Quantum Gravity, Proceedings of the Photon14 Conference, Quantum Electronics & Photonics 2014, Section on Quantum Information, Institute of Physics (IOP), Imperial College London, London, UK, 2014.
L. Gyongyosi. Information Processing Structure of Quantum Gravity, Proceedings of the Gordon Research Conference on Quantum Science: Simulation, Verification, and Control of Complex Quantum Many-Body Systems, Stonehill College, Easton, MA, USA, July 27-August 1, 2014.
L. Gyongyosi. Multiuser Quadrature Allocation for Continuous-Variable Quantum Key Distribution, Quantum Theory from Problems to Advances (QTPA) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 9-12, 2014.
L. Gyongyosi. Quantum Imaging of High-Dimensional Hilbert Spaces with Radon Transform, Quantum Theory from Problems to Advances (QTPA) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 9-12, 2014.
L. Gyongyosi, S. Imre. Information Processing with Quantum Gravity Environment, Quantum Theory from Problems to Advances (QTPA) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 9-12, 2014.
L. Gyongyosi, S. Imre. Information Processing Structure of Quantum Gravity, APS DAMOP 2014, Proceedings of the 45th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Session on Quantum Information Theory, The American Physical Society, Volume 59, Number 8, Madison, Wisconsin, USA, June 2-6, 2014.
L. Gyongyosi, S. Imre. Adaptive Multicarrier Quadrature Division Modulation for Continuous-Variable Quantum Key Distribution, Proceedings of SPIE Quantum Information and Computation XII, Baltimore, Maryland, USA, May 8-9, 2014.
L. Gyongyosi, S. Imre. Long-Distance Continuous-Variable Quantum Key Distribution with Scalar Reconciliation and Gaussian Adaptive Multicarrier Quadrature Division, Proceedings of the APS March Meeting 2014, Session on Quantum Communication, Decoherence, and Cryptography, Bulletin of the American Physical Society, Volume 59, Number 1, Denver, Colorado, USA, March 3-7, 2014.
L. Gyongyosi, S. Imre. Long-distance two-way continuous variable quantum key distribution over optical fiber with Gaussian modulation, Proceedings of SPIE Photonics West OPTO 2014, "Advances in Photonics of Quantum Computing, Memory, and Communication VII", Session: Quantum Communication and Quantum Computing with Photons II, San Francisco, California, USA, February 1-6, 2014.
L. Gyongyosi, Long-Distance Two-way Continuous-Variable Quantum Key Distribution with a Gaussian Modulation, Single Photon Workshop 2013 (SPW 2013) Proceedings, Oak Ridge National Laboratory, Quantum Information Science Group, Oak Ridge, USA, October 15-18, 2013.
L. Gyongyosi. Improved Long-Distance Two-way Continuous Variable Quantum Key Distribution over Optical Fiber, Session on Quantum Communications, Proceedings of 2013 Frontiers in Optics/Laser Science XXIX (FiO/LS), Orlando, Florida, USA, October 6-10, 2013. OSA Jean Bennett Memorial Award 2013, The Optical Society of America, Orlando, Florida, USA, 2013.
L. Gyongyosi, S. Imre. Entanglement Sharing without Entanglement Transmission, Session on Quantum Communications, Proceedings of 2013 Frontiers in Optics/Laser Science XXIX (FiO/LS), Orlando, Florida, USA, October 6-10, 2013.
L. Gyongyosi, S. Imre. Quantum Communication over Partially Degradable Quantum Channels, Session on Optics and Photonics of Disordered Systems, Proceedings of 2013 Frontiers in Optics/Laser Science XXIX (FiO/LS), Orlando, Florida, USA, October 6-10, 2013.
L. Gyongyosi, S. Imre. Long-Distance Two-way Continuous Variable Quantum Key Distribution over Optical Fiber with a Gaussian Modulation, IONS-NA 7 Proceedings, 7th North American IONS conference, Center for Optoelectronics and Optical Communications, The University of North Carolina at Charlotte (UNC Charlotte), USA, October 2-4, 2013. Award of the American Physical Society (APS), The University of North Carolina at Charlotte (UNCC), USA.
L. Gyongyosi. The Correlation Conversion Property of Quantum Channels, Quantum Foundations and Quantum Information (QF&QI) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 10-13, 2013.
L. Gyongyosi, S. Imre. The Quantum Capacity of a Partially Degradable Quantum Channel, Quantum Foundations and Quantum Information (QF&QI) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 10-13, 2013.
L. Gyongyosi, S. Imre. Polar Codes for Partially Degradable Quantum Channels, Quantum Foundations and Quantum Information (QF&QI) Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, June 10-13, 2013.
L. Gyongyosi, S. Imre. Quantum Channels that cannot Transmit Quantum Correlations can Generate Quantum Entanglement from Classical Correlation, Proceedings of APS DAMOP 2013, The 44th Annual DAMOP Meeting of the APS Division of Atomic, Molecular, and Optical Physics, (American Physical Society), Section on Quantum Information and Communication, Quebec City, Quebec, Canada, June, 2013.
L. Gyongyosi. Polaractivation of Hidden Private Classical Capacity Region of Quantum Channels, Proceedings of the IEEE Symposium on Quantum Computing and Computational Intelligence 2013 (IEEE QCCI 2013), IEEE Symposium Series on Computational Intelligence (IEEE SSCI 2013), Singapore, April 16-19, 2013.
L. Gyongyosi, S. Imre. Pilot Quantum Error Correction for Global-Scale Quantum Communications, Proceedings of the IEEE Symposium on Quantum Computing and Computational Intelligence 2013 (IEEE QCCI 2013), IEEE Symposium Series on Computational Intelligence (IEEE SSCI 2013), Singapore, April 16-19, 2013.
L. Gyongyosi, S. Imre. The Correlation Conversion Property of Quantum Channels, Proceedings of SPIE Quantum Information and Computation XI, Session on Quantum Entanglement, Baltimore, Maryland, USA, April 29-May 3, 2013. SPIE 2013 Quantum Information and Computation Award, SPIE Defense, Security, and Sensing 2013, USA.
L. Gyongyosi, S. Imre. Noise of Quantum Channels can Generate Quantum Entanglement from Classical Correlation, Proceedings of the APS March Meeting 2013 (American Physical Society), Session on Entanglement in Many-Body Systems, Bulletin of the American Physical Society, Volume 58, Number 1, Baltimore, Maryland, USA, March 18-22, 2013.
L. Gyongyosi, S. Imre. Polaractivation for the Opening of Hidden Capacity-Domains of Quantum Channels, Proceedings of SPIE Photonics West OPTO 2013, "Advances in Photonics of Quantum Computing, Memory, and Communication VI", Section on Quantum Communication, San Francisco, California, USA, February 2-7, 2013. SPIE Photonics West Opto 2013 Award, Advances in Photonics of Quantum Computing, Memory, and Communication, San Francisco, California, USA.
L. Gyongyosi, S. Imre. Polaractivation of Zero-Capacity Optical Quantum Channels, Frontiers in Optics (FiO) 2012 Proceedings, Section on Quantum Computation and Communications, Rochester, New York, USA, October 14-18, 2012. OSA Incubic/Milton Chang Award, The Optical Society of America, USA.
L. Gyongyosi, S. Imre. Concatenated Capacity-Achieving Polar Codes for Optical Quantum Channels, Frontiers in Optics (FiO) 2012 Proceedings, Section on Quantum Computation and Communications, Rochester, New York, USA, October 14-18, 2012.
L. Gyongyosi, S. Imre. Quantum Noise with Stimulated Emission for Classical Communication over Zero-Capacity Optical Channels, Frontiers in Optics (FiO) 2012 Proceedings, Section on Quantum Computation and Communications, Rochester, New York, USA, October 14-18, 2012.
L. Gyongyosi, S. Imre. Polaractive Quantum Channels for Quantum Repeater Networks, OSA IONS-NA4 Conference Proceedings, Columbia University, City College of New York, New York, USA, October 10-12, 2012. Award of Columbia University, New York, USA.
L. Gyongyosi, S. Imre. Enhanced Private Communication with Concatenated Quantum Polar Codes, Proceedings of QCRYPT 2012, The 2nd Annual Conference on Quantum Cryptography (Centre for Quantum Technologies), National University of Singapore, Singapore, September 10-14, 2012.
L. Gyongyosi, S. Imre. Polaractivation of Private Classical Capacity of Non-Private Quantum Channels, Proceedings of QCRYPT 2012, The 2nd Annual Conference on Quantum Cryptography (Centre for Quantum Technologies), National University of Singapore, Singapore, September 10-14, 2012.
L. Gyongyosi, S. Imre. Private Communication over Quantum Relay Channels Using Quantum Polar Codes and Superactivation-assistance, Proceedings of QCRYPT 2012, The 2nd Annual Conference on Quantum Cryptography (Centre for Quantum Technologies), National University of Singapore, Singapore, September 10-14, 2012.
L. Gyongyosi, S. Imre. On the Mathematical Limits of Quantum Communication over Superactivated Quantum Channels, Proceedings of QCRYPT 2012, The 2nd Annual Conference on Quantum Cryptography (Centre for Quantum Technologies), National University of Singapore, Singapore, September 10-14, 2012. Award of Qcrypt 2012, National University of Singapore, Singapore.
L. Gyongyosi, S. Imre. Polaractivation of Quantum Channels, Proceedings of the 11th International Conference on Quantum Communication, Measurement and Computing (QCMC 2012), Section on Quantum Information and Communication Theory, Vienna University of Technology, Vienna, Austria, July 30-August 3, 2012.
L. Gyongyosi, S. Imre. Quasi-Superactivation of Zero-Capacity Quantum Channels, Proceedings of the 11th International Conference on Quantum Communication, Measurement and Computing (QCMC 2012), Section on Quantum Information and Communication Theory, Vienna University of Technology, Vienna, Austria, July 30-August 3, 2012.
L. Gyongyosi, S. Imre. Quantum Polar Coding for Probabilistic Quantum Relay Channels, Proceedings of the 11th International Conference on Quantum Communication, Measurement and Computing (QCMC 2012), Section on Quantum Information and Communication Theory, Vienna University of Technology, Vienna, Austria, July 30-August 3, 2012.
L. Gyongyosi, S. Imre. Polaractivation of Zero-Capacity Quantum Channels, Quantum Science Symposium-2012 Proceedings, Frontiers in Quantum Information, Computing and Communication (QICC)-2012 Meeting, Peterhouse College, University of Cambridge, Cambridge, United Kingdom, 2012.
L. Gyongyosi, S. Imre. On the Mathematical Boundaries of Communication with Zero-Capacity Quantum Channels, Proceedings of the Alan Turing Centenary Conference (Turing-100), University of Manchester, Manchester, United Kingdom, June 22-25, 2012.
L. Gyongyosi, S. Imre. Secure Communication over Zero Private-Capacity Quantum Channels, Proceedings of the Alan Turing Centenary Conference (Turing-100), University of Manchester, Manchester, United Kingdom, June 22-25, 2012.
L. Gyongyosi, S. Imre. Transmission of Classical Information over Zero-Capacity Optical Quantum Channels, Proceedings of the Photon- 12 Conference: Optics & Photonics 2012 and Quantum Electronics & Photonics 2012 (QEP- 20), Section on Quantum Information, Institute of Physics (IOP), Durham University, Durham, United Kingdom, September 3-6, 2012.
L. Gyongyosi, S. Imre. Polaractivation of Noisy Optical Quantum Channels, Proceedings of the Photon-12 Conference: Optics & Photonics 2012 and Quantum Electronics & Photonics 2012 (QEP-20), Section on Quantum Information, Institute of Physics (IOP), Durham University, Durham, United Kingdom, September 3-6, 2012.
L. Gyongyosi, S. Imre. Mathematical Limit in the Superactivation of Zero-Capacity Quantum Channels, Quantum Theory: Reconsideration of Foundations - 6 (QTRF6) Conference Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, 2012.
L. Gyongyosi, S. Imre. Polaractivation of Zero-Capacity Quantum Channels, Quantum Theory: Reconsideration of Foundations - 6 (QTRF6) Conference Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, 2012.
L. Gyongyosi, S. Imre. Achieving Classical Communication with Quantum Entanglement and Stimulated Emission over Zero-Capacity Quantum Channels, Quantum Theory: Reconsideration of Foundations - 6 (QTRF6) Conference Proceedings, International Centre for Mathematical Modeling in physics, engineering and cognitive sciences (ICMM), Linnaeus University, Växjö, Sweden, 2012.
L. Gyongyosi, S. Imre. Quantum Polar Coding for Noisy Optical Quantum Channels, Proceedings of the APS DAMOP 2012 Meeting, The 43rd Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, (American Physical Society), Anaheim, California, USA, June, 2012.
L. Gyongyosi, S. Imre. Classical Communication with Stimulated Emission over Zero-Capacity Optical Quantum Channels, Proceedings of the APS DAMOP 2012 Meeting, The 43rd Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, (American Physical Society), Anaheim, California, USA, June, 2012. Award of APS DAMOP12, American Physical Society, California, USA.
L. Gyongyosi, S. Imre. Superactivation of Zero-Capacity Quantum Channels is Limited by the Quantum Relative Entropy Function, Proceedings of the 26th Quantum Information Technology Symposium (QIT26), (Quantum Information Technology Committee, The Institute of Electronics, Information and Communication Engineers), Fukui University, Fukui, Japan, May, 2012.
L. Gyongyosi, S. Imre. The Pilot Quantum Error-Correction Protocol, Proceedings of the 26th Quantum Information Technology Symposium (QIT26), (Quantum Information Technology Committee, The Institute of Electronics, Information and Communication Engineers), Fukui University, Fukui, Japan, May, 2012.
L. Gyongyosi, S. Imre. Private Classical Communication over Zero-Capacity Quantum Channels Using Quantum Polar Codes, Proceedings of the 7th Conference on Theory of Quantum Computation, Communication, and Cryptography (TQC 2012), The University of Tokyo, Tokyo, Japan, May, 2012.
L. Gyongyosi, S. Imre. Classical Communication with Zero-Capacity Quantum Channels, Proceedings od the 7th Conference on Theory of Quantum Computation, Communication, and Cryptography (TQC 2012), The University of Tokyo, Tokyo, Japan, May, 2012.
L. Gyongyosi, S. Imre. Classical and Quantum Communication with Superactivated Quantum Channels, PhD Workshop, TAMOP-4.2.2/B-10/1-2010-0009, Doctoral School on Computer Science and Information Technologies, Budapest University of Technology and Economics, March, 2012.
L. Gyongyosi, S. Imre. On-the-Fly Quantum Error-Correction for Space-Earth Quantum Communication Channels, Proceedings of the First NASA Quantum Future Technologies Conference (QFT 2012), Quantum Laboratory, Center for Applied Physics, NASA Ames Research Center, Moffett Field, California, USA, January, 2012.
L. Gyongyosi, S. Imre. Superactivated Quantum Repeaters, Proceedings of Quantum Information Processing 2012 (QIP2012), University of Montreal, Quebec, Canada, December, 2011. Award of QIP2012, University of Montreal, Canada.
L. Gyongyosi, S. Imre. Pilot Quantum Error-Correction for Noisy Quantum Channels, Proceedings of the Second International Conference on Quantum Error Correction (QEC11), University of Southern California, Los Angeles, USA, December, 2011. Award of QEC2011, University of Southern California, USA.
L. Gyongyosi, S. Imre. Noisy Gaussian Quantum Channels with Superactivated Zero-Error Quantum Capacity, Proceedings of the Frontiers in Quantum Information, Computing and Communication (QICC)-2011 Meeting, ‘Quantum Systems to Qubits, Optics and Semiconductors’, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts, USA, September, 2011.
L. Gyongyosi, S. Imre. Zero-Error Transmission of Classical Information over Superactivated Optical Quantum Channels, Proceedings of the International Conference on Quantum, Atomic, Molecular and Plasma Physics, Section on Quantum Information and Computing, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom, USA, September, 2011.
L. Gyongyosi, S. Imre. High Performance Quantum Repeaters with Superactivated Gaussian Quantum Channels, IONS North America, IONS-NA-3 Proceedings, (Stanford Optical Society, Stanford Photonics Research Center), Stanford University, Stanford, California, USA, October, 2011. Award of Stanford University, Stanford Optical Society, USA.
L. Gyongyosi, S. Imre. Perfect Quantum Communication with Very Noisy Gaussian Optical Fiber Channels, Proceedings of Frontiers in Optics (FiO) 2011, OSA's 95th Annual Meeting, Section on Quantum Computation and Communication, (American Physical Society, Optical Society of America), San Jose, California, USA, October, 2011.
L. Bacsardi, L. Gyongyosi, S. Imre. Redundancy-Free Quantum Coding Methods in Satellite Communications, 62nd International Astronautical Congress, Cape Town, SA. 2011.
L. Gyongyosi, S. Imre. Efficient Quantum Repeaters without Entanglement Purification, Proceedings of the International Conference on Quantum Information (ICQI) 2011, The Optical Society of America (OSA), University of Rochester, University of Ottawa, Ottawa, Canada, June, 2011.
L. Gyongyosi, S. Imre. Channel Capacity Restoration of Noisy Optical Quantum Channels, Proceedings of the ICOAA '11 Conference, Section on Optical Quantum Communications, University of Cambridge, Cambridge, United Kingdom, February, 2011.
L. Gyongyosi, S. Imre. Informational Geometric Analysis of Superactivation of Zero-Capacity Optical Quantum Channels, Proceedings of SPIE Photonics West OPTO 2011, Advanced Quantum and Optoelectronic Applications, "Advances in Photonics of Quantum Computing, Memory, and Communication IV", Section on Quantum Communication, The Moscone Center, San Francisco, California, USA, January, 2011.
L. Gyongyosi, S. Imre. Algorithmic Solution to Superactivation of Zero-Capacity Optical Quantum Channels, Proceedings of the IEEE Photonics Global Conference (PGC) 2010, Nanyang Technological University, IEEE Photonics Society, Nature Photonics, Suntec City, Singapore, 2010.
L. Gyongyosi, S. Imre. Information Geometric Superactivation of Zero-Capacity Quantum Channels, Proceedings of the Second International Conference on Quantum Information and Technology - New Trends in Quantum Information Technology (ICQIT2010), Quantum Information Science Theory Group (QIST), National Institute of Informatics (NII), National Institute of Information and Communications Technology (NICT), QIST, NII, Tokyo, Japan, 2010.
L. Gyongyosi, S. Imre. Capacity Recovery of Useless Photonic Quantum Communication Channels, ALS Conference Proceedings, Lawrence Berkeley National Laboratory (Berkeley Lab), University of California, Berkeley, California, USA, 2010.
L. Gyongyosi, S. Imre. Method for Discovering of Superactive Zero-Capacity Optical Quantum Channels, IONS-NA Conference, (The Optical Society of America (OSA), American Physical Society (APS), SPIE—The International Society for Optical Engineering, Rochester Institute of Optics, University of Maryland), University of Arizona, Tucson (Arizona), USA, 2010. Award of University of Arizona, USA.
L. Gyongyosi, S. Imre. Information Geometrical Solution to Additivity of Non-Unital Quantum Channels, Proceedings of the 10th Quantum Communication, Measurement and Computing Conference (QCMC 2010), Section on Quantum Computing and Quantum Information Theory (Centre for Quantum Computer Technology), University of Queensland, Brisbane, Queensland, Australia, July, 2010.
L. Gyongyosi, S. Imre. Computational Information Geometric Analysis of Quantum Channel Additivity, Proceedings of the Photon10 Conference, Quantum Electronics Group (QEP-19), Section on Quantum information, University of Southampton, Institute of Physics (IOP) Optics and Photonics Division, University of Southampton, Southampton, UK, 2010.
L. Gyongyosi, S. Imre. Novel Geometrical Solution to Additivity Problem of Classical Quantum Channel Capacity, Proceedings of the 33rd IEEE Sarnoff Symposium, IEEE Princeton/Central Jersey Section, Princeton University, Princeton, New Jersey, USA, April, 2010.
L. Gyongyosi, S. Imre. Computational Geometric Analysis of Physically Allowed Quantum Cloning Transformations for Quantum Cryptography, International Conference on Computer Engineering and Applications, Section on Quantum Computing, (CEA '10), University of Harvard, Cambridge (Massachusetts), USA, 2010. Best Paper Award 2010, Harvard University, Cambridge, USA.
L. Bacsardi, L. Gyongyosi, S. Imre. Using Redundancy-free Quantum Channels for Improving the Satellite Communication, PSATS 2010, 2nd International ICST Conference on Personal Satellite Services, Section on Satellite Quantum Communications, Rome, Italy, February 4-6 2010. Appear in: Lecture Notes of The Institute for Computer Sciences Social-Informatics and Telecommunications Engineering, no. 43, pp. 317-329, (ISSN: 1867-8211), 2010.
L. Gyongyosi, S. Imre. Quantum Informational Geometry for Secret Quantum Communication, Proceedings of the First International Conference on Future Computational Technologies and Applications, Future Computing 2009, Section on Quantum Computing, International Academy, Research and Industry Association, Athens, Greece, 2009. Best Paper Award, Future Computing 2009.
L. Gyongyosi, L. Bacsardi, S. Imre. Novel Approach for Quantum Mechanical Based Autonomic Communication, Proceedings of the First International Conference on Future Computational Technologies and Applications, Future Computing 2009, Section on Quantum Computing, International Academy, Research and Industry Association, Athens, Greece, 2009.
L. Bacsardi, L. Gyongyosi, S. Imre. Solutions for Redundancy-free Error Correction In Quantum Channel, International Conference on Quantum Communication and Quantum Networking, Vico Equense, Sorrento peninsula, Naples, Italy. Appear in: Lecture Notes of the Institute for Computer Sciences Social-Informatics and Telecommunications Engineering, no. 36, pp. 117-124, October 26-30, 2009.
L. Gyongyosi, S. Imre. Quantum Divergence based Quantum Channel Security Estimation, Proceedings of the IEEE N2S’2009 International Conference on Network and Service Security, Section on Quantum Cryptography and QKD, IFIP TC6 WG, IEEE France, Paris, France, June, 2009.
L. Gyongyosi, S. Imre. Unduplicable Quantum Data Medium Based Secret Decryption and Verification, Proceedings of the 4th IEEE International Conference for Internet Technology and Secured Transactions (ICITST-2009), IEEE UK & RI, London, United Kingdom, November 9-12, 2009.
L. Gyongyosi, S. Imre. Fidelity Analysis of Quantum Cloning Attacks in Quantum Cryptography, Proceedings of the IEEE ConTEL 2009 International Conference on Telecommunications, IEEE Communications Society, Zagreb, Croatia, 2009.
L. Gyongyosi. Really unbreakable? The Security Analysis of Quantum Cryptography, Hacktivity conference, Budapest, 2008.
L. Gyongyosi. Quantum copy-protection based on holographic data storage, BME, Faculty of Electrical Engineering and Informatics, Department of Telecommunications, 2008.
L. Gyongyosi. Quantum Computation in computer network attacking, BME, Department of Measurement and Information Systems, Search-Lab, 2007.
L. Gyongyosi. The holographic quantum copy-protection protocol, BME, Faculty of Electrical Engineering and Informatics, Scientific Students Association, 2007. Award of the Scientific Students Association, BME.
L. Gyongyosi. A technical breakthrough in prime factorization, BME, Faculty of Electrical Engineering and Informatics, Scientific Students Association, 2007. Award of the Scientific Students Association, BME.
L. Gyongyosi. Simulation of the perfect quantum based key agreement, National Scientific Students Association (OTDK), 2007. Award of the Hungarian Scientific Students Association of Computer Science and Information Technology.
L. Gyongyosi. Simulation of the perfect quantum based key agreement, Faculty of Electrical Engineering and Informatics, Scientific Students Association, 2006. 1st prize, BME.
L. Gyongyosi. Formal Analysis of Quantum Cryptography, Faculty of Electrical Engineering and Informatics, Scientific Students Association, 2006. 3rd prize, BME.
L. Gyongyosi. Quantum State Optimization and Computational Pathway Evaluation for Gate-Model Quantum Computers
2020, Subjects: Quantum Physics (quant-ph)
Download: arXiv:2003.05255
L. Gyongyosi, S. Imre. Theory of Noise-Scaled Stability Bounds and Entanglement Rate Maximization in the Quantum Internet
2020, Subjects: Quantum Physics (quant-ph); Networking and Internet Architecture (cs.NI)
Download: arXiv:2003.05245
L. Gyongyosi, S. Imre. Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices
2020, Subjects: Quantum Physics (quant-ph); Networking and Internet Architecture (cs.NI)
Download: arXiv:2003.05244
L. Gyongyosi, S. Imre. Entanglement Accessibility Measures for the Quantum Internet
2020, Subjects: Quantum Physics (quant-ph); Networking and Internet Architecture (cs.NI)
Download: arXiv:2003.05239
L. Gyongyosi, S. Imre. Training Optimization for Gate-Model Quantum Neural Networks
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1909.01048
L. Gyongyosi, S. Imre. State Stabilization for Gate-Model Quantum Computers
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1909.01044
L. Gyongyosi, S. Imre. Dense Quantum Measurement Theory
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1905.00260
L. Gyongyosi, S. Imre. Opportunistic Entanglement Distribution for the Quantum Internet
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1905.00258
L. Gyongyosi, S. Imre. Entanglement Access Control for the Quantum Internet
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1905.00256
L. Gyongyosi, S. Imre. Adaptive Routing for Quantum Memory Failures in the Quantum Internet
2019, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1905.00254
L. Gyongyosi, S. Imre. Topology Adaption for the Quantum Internet
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1809.02928
L. Gyongyosi, S. Imre. Multilayer Optimization for the Quantum Internet
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1808.07860
L. Gyongyosi, S. Imre. Entanglement Availability Differentiation Service for the Quantum Internet
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1808.07859
L. Gyongyosi, S. Imre. A Poisson Model for Entanglement Optimization in the Quantum Internet
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1803.02469
L. Gyongyosi, S. Imre. Quantum Circuit Design for Objective Function Maximization in Gate-Model Quantum Computers
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1803.02460
L. Gyongyosi, S. Imre. Decentralized Base-Graph Routing for the Quantum Internet
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1801.02020
L. Gyongyosi, S. Imre, Hung Viet Nguyen: A Survey on Quantum Channel Capacities
2018, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1801.02019
L. Gyongyosi, S. Imre. Entanglement-Gradient Routing for Quantum Networks
2017, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1710.02779
L. Gyongyosi. Iterative Secret Key Rate Adapting with Error Minimization for Continuous-Variable Quantum Key Distribution
2016, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1610.02823
L. Gyongyosi. Diversity Extraction for Multicarrier Continuous-Variable Quantum Key Distribution
2016, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1610.02822
L. Gyongyosi. Statistical Quadrature Evolution by Inference for Continuous-Variable Quantum Key Distribution
2016, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1603.09247
L. Gyongyosi. Correlation Measure Equivalence in Dynamic Causal Structures of Quantum Gravity
2016, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Download: arXiv:1603.02416
L. Gyongyosi. Gaussian Quadrature Inference for Multicarrier Continuous-Variable Quantum Key Distribution
2015, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1504.05574
L. Gyongyosi. Distribution Statistics and Random Matrix Formalism of Multicarrier Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1410.8273
L. Gyongyosi. Adaptive Quadrature Detection for Multicarrier Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1408.6493
L. Gyongyosi. Subcarrier Domain of Multicarrier Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1406.6949
L. Gyongyosi. Multidimensional Manifold Extraction for Multicarrier Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1405.6948
L. Gyongyosi. Security Thresholds of Multicarrier Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1404.7109
L. Gyongyosi. Smooth Entropy Transfer of Quantum Gravity Information Processing
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Download: arXiv:1403.6717
L. Gyongyosi. Singular Layer Transmission for Continuous-Variable Quantum Key Distribution
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1402.5110
L. Gyongyosi, S. Imre. Theory of Quantum Gravity Information Processing
2014, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Download: arXiv:1401.6706
L. Gyongyosi, S. Imre. Multiple Access Multicarrier Continuous-Variable Quantum Key Distribution
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1312.3614
L. Gyongyosi. A Statistical Model of Information Evaporation of Perfectly Reflecting Black Holes
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Download: arXiv:1311.3598
L. Gyongyosi. Quantum Imaging of High-Dimensional Hilbert Spaces with Radon Transform
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1310.8347
L. Gyongyosi. Adaptive Multicarrier Quadrature Division Modulation for Continuous-Variable Quantum Key Distribution
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1310.1608
L. Gyongyosi. Low-Dimensional Reconciliation for Continuous-Variable Quantum Key Distribution
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1308.1391
L. Gyongyosi. The Private Classical Capacity of a Partially Degradable Quantum Channel
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1305.5970
L. Gyongyosi. The Structure and Quantum Capacity of a Partially Degradable Quantum Channel
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1304.5666
L. Gyongyosi. Quantum Information Transmission over a Partially Degradable Channel
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1303.0606
L. Gyongyosi. The Correlation Conversion Property of Quantum Channels
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1302.3118
L. Gyongyosi. Polaractivation of Hidden Private Classical Capacity Region of Quantum Channels
2013, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1302.3114
L. Gyongyosi, S. Imre. Concatenated Capacity-Achieving Polar Codes for Optical Quantum Channels
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1302.3110
L. Gyongyosi, S. Imre. Properties of the Quantum Channel
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1208.1270
L. Gyongyosi, S. Imre. Private Quantum Coding for Quantum Relay Networks
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1208.0661
L. Gyongyosi, S. Imre. Pilot Quantum Error Correction for Global-Scale Quantum Communications
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1207.4502
L. Gyongyosi, S. Imre. Algorithmic Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Quantum Channels
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1207.4491
L. Gyongyosi, S. Imre. Information Geometric Security Analysis of Differential Phase Shift Quantum Key Distribution Protocol
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1207.4467
L. Gyongyosi, S. Imre. An Improvement in Quantum Fourier Transform
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1207.4464
L. Gyongyosi, S. Imre. A Quantum Copy-Protection Scheme with Authentication
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1207.4462
S. Imre, L. Gyongyosi. Quantum-assisted and Quantum-based Solutions in Wireless Systems
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1206.5996
L. Gyongyosi. Information Geometric Superactivation of Asymptotic Quantum Capacity and Classical Zero-Error Capacity of Zero-Capacity Quantum Channels
PhD. Thesis, Budapest University of Technology and Economics, 2013, 392 pages, 4 tables, 128 figures, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1206.5980
L. Gyongyosi, S. Imre. Quasi-Superactivation of Classical Capacity of Zero-Capacity Quantum Channels
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1206.5693
L. Gyongyosi, S. Imre. Superactivation of Quantum Channels is Limited by the Quantum Relative Entropy Function
2012, Subjects: Quantum Physics (quant-ph); Information Theory (cs.IT)
Download: arXiv:1206.5691
Professional Service
Program committee, IEEE International Conference on Communications 2025, Selected Areas in Communications: Quantum Communications and Information Technology (IEEE ICC'25 - SAC-11 QCIT), IEEE, 2025.
Program committee, IEEE International Conference on Communications 2024, Selected Areas in Communications: Quantum Communications and Information Technology (IEEE ICC'24 - SAC-11 QCIT), IEEE, 2024.
Program committee, IEEE Global Communications Conference (IEEE Globecom) 2023, Selected Areas in Communications: Quantum Communications and Computing, IEEE, 2023.
Program committee, IEEE International Conference on Communications 2023; Selected Areas in Communications: Quantum Communications and Information Technology (IEEE ICC'23 - SAC-11 QCIT), IEEE, 2023.
Program committee, IEEE Global Communications Conference (IEEE Globecom) 2022, Quantum Communications and Information Technology (QCIT), IEEE, 2022.
Program committee, IEEE International Conference on Communications (IEEE ICC) 2022, Quantum Communications and Computing, IEEE, 2022.
Program committee, IEEE International Conference on Communications (IEEE ICC) 2021, Quantum Communications and Computing, IEEE, 2021.
Program committee, IEEE Global Communications Conference (IEEE Globecom) 2020, Quantum Communications and Information Technology (QCIT), IEEE, 2020.
Program committee, IEEE Global Communications Conference (IEEE Globecom) 2019, Quantum Communications and Information Technology (QCIT), IEEE, 2019.
Program committee, IEEE Global Communications Conference (IEEE Globecom) 2018, Quantum Communications and Information Technology (QCIT), IEEE, 2018.
Program committee, QuantumComm - The Improving Quantum World,
2nd International ICST Conference on Quantum Communication and Quantum Networking, 2012.
Editor
Associate Editor, Quantum Communication, Frontiers in Quantum Science and Technology, Frontiers, 2021-Present.
Editor, Quantum Internet, Internet Technology Letters, Wiley, ISSN:2476-1508, 2019-Present.
Referee
IEEE Communications Magazine, Institute of Electrical and Electronics Engineers (IEEE)
IEEE Communications Surveys and Tutorials, Institute of Electrical and Electronics Engineers (IEEE)
IEEE/OSA Journal of Lightwave Technology, ISSN: 0733-8724 (IEEE)
BME-TOP100 Best Researcher Award, 1st place (awarded every five years), Top 1 researcher in the 5-year period of 2018-2023, Budapest University of Technology and Economics, 2023.
Research in Quantum Information and Communication, Ericsson, Pro Progressio, Hungary, 2022.
MTA Premium Postdoctoral Research Program 2019, Hungarian Academy of Sciences, 2019.
OSA Jean Bennett Memorial Award 2013, The Optical Society of America, Orlando, Florida, USA, 2013.
SPIE 2013 Quantum Information and Computation Award, SPIE Defense, Security, and Sensing 2013, USA, 2013.
APS PhD Student Grant Award 2013, The American Physical Society (APS), The University of North Carolina at Charlotte (UNCC), USA, 2013.
SPIE Photonics West OPTO 2013 Award, Advances in Photonics of Quantum Computing, Memory, and Communication, San Francisco, California, USA, 2013.
Incubic/Milton Chang Award, The Optical Society of America, Rochester, New York, USA, 2012.
BME PhD Researcher Fellowship 2012, Budapest University of Technology and Economics, 2012.
PhD Student Grant Award of Columbia University, New York, USA, 2012.
PhD Student Grant Award of QCRYPT 2012, The 2nd Annual Conference on Quantum Cryptography (Centre for Quantum Technologies), National University of Singapore, Singapore, 2012.
PhD Student Grant Award of APS DAMOP 2012 (DAMOP12), APS Division of Atomic, Molecular, and Optical Physics, American Physical Society (APS), California, USA, 2012.
PhD Student Grant Award of Quantum Information Processing 2012 (QIP2012), University of Montreal, Canada, 2012.
PhD Student Grant Award of The Second International Conference on Quantum Error Correction (QEC2011), University of Southern California (USC), USA, 2011.
PhD Student Grant Award of Stanford University, Stanford Optical Society, USA, 2011.
PhD Candidate Scholarship 2011, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, 2011.
BME PhD Researcher Fellowship 2011, Budapest University of Technology and Economics, 2011.
PhD Student Grant Award of University of Arizona, Optical Society of America (OSA), USA, 2010.
BME PhD Researcher Fellowship 2010, Budapest University of Technology and Economics, 2010.
"SANDOR CSIBI" PhD Researcher Scholarship 2010, Pro Progressio, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, 2010.
BEST PAPER AWARD 2010 from Harvard University, Cambridge, USA, 2010.
BEST PAPER AWARD 2009, FUTURE COMPUTING, The First International Conference on Future Computational Technologies and Applications, 2009.
BEST PAPER AWARD 2009 - "POLLAK-VIRAG" - from the Scientific Association for Infocommunication (Hungary), 2009.
Republican Scholarship, Budapest University of Technology and Economics, 2008.
Professional Scholarship, Faculty of Electrical Engineering and Informatics, BME (Level A, highest category), 2008.
University Professional Scholarship, BME (Level A, highest category), 2007.
