Secret key rates of free‐space optical continuous‐variable quantum key distribution

Gyöngyösi, László; Imre, Sándor

doi:10.1002/dac.4152

Cited by 8 publications

(4 citation statements)

References 46 publications

(197 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We denote the total number of non-zero entries in an LDPC matrix as G, and adopt the well-known Belief Propagation (BP) decoder [40] for error correction. We define the total number of arithmetic operations of SR as m−1 j=0 E j D j , where, for each S j , E j is the number of arithmetic operations executed within a decoding iteration, 9 and D j is the number of decoding iterations [41]. We note, in our GPU-based SR, E j and D j are different for the m slices of each block since m LDPC matrices are used to reconcile the m slices.…”

Section: Analysing the Computational Complexity Of Srmentioning

confidence: 99%

“…Note, for N R larger than approximately 10 5 , D j is independent of N R (a result we will adopt later). Assuming the Gaussian approximation within the Density Evolution Algorithm, D j is given by [42] 9 In a BP decoder, a decoding iteration is one pass through the decoding algorithm.…”

Section: Analysing the Computational Complexity Of Srmentioning

confidence: 99%

“…Continuous Variable (CV) Quantum Key Distribution (QKD) has been intensively studied and significant breakthroughs have been achieved in both theory and experiment (see [1] for review). Compared to Discrete Variable (DV) QKD [2]- [5], CV-QKD can be implemented with well-developed technologies (e.g., homodyne detectors) in commercial fibreoptic networks [6], [7] and free-space optical communications [8], [9], providing it a potential advantage in practical deployments [10]- [14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimised Multithreaded CV-QKD Reconciliation for Global Quantum Networks

Ai¹,

Malaney²

2021

Preprint

View full text Add to dashboard Cite

Designing a practical Continuous Variable (CV) Quantum Key Distribution (QKD) system requires an estimation of the quantum channel characteristics and the extraction of secure key bits based on a large number of distributed quantum signals. Meeting this requirement in short timescales is difficult. On standard processors, it can take several hours to reconcile the required number of quantum signals. This problem is exacerbated in the context of Low Earth Orbit (LEO) satellite CV-QKD, in which the satellite flyover time is constrained to be less than a few minutes. A potential solution to this problem is massive parallelisation of the classical reconciliation process in which a large-code block is subdivided into many shorter blocks for individual decoding. However, the penalty of this procedure on the important final secured key rate is non-trivial to determine and hitherto has not been formally analysed. Ideally, a determination of the optimal reduced block size, maximising the final key rate, would be forthcoming in such an analysis. In this work, we fill this important knowledge gap via detailed analyses and experimental verification of a CV-QKD sliced reconciliation protocol that uses large block-length low-density parity-check decoders. Our new solution results in a significant increase in the final key rate relative to non-optimised reconciliation. In addition, it allows for the acquisition of quantum secured messages between terrestrial stations and LEO satellites within a flyover timescale even using off-the-shelf processors. Our work points the way to optimised global quantum networks secured via fundamental physics.

show abstract

Section: Analysing the Computational Complexity Of Srmentioning

confidence: 99%

Section: Analysing the Computational Complexity Of Srmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimised Multithreaded CV-QKD Reconciliation for Global Quantum Networks

Ai¹,

Malaney²

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Although free-space CVQKD provides greater flexibility in transmission through atmospheric channels, its practical implementation is affected by the uncertainty of the atmospheric channel, and there are many outstanding issues to be addressed [4] The elliptical beam model is a commonly used model for analyzing the transmission performance of freespace CVQKD. During transmission, CVQKD signals are affected by atmospheric effects including atmospheric attenuation, turbulence, and other constraints, which can introduce additional noise to the signal.…”

Section: Introductionmentioning

confidence: 99%

Parameter estimation for free-space continuous variable quantum key distribution based on PointNet

GUan,

Chen,

Zhang

et al. 2024

Workshop on Electronics Communication Engineering (WECE 2023)

View full text Add to dashboard Cite

Order statistics and random matrix theory of multicarrier continuous‐variable quantum key distribution

Gyöngyösi

2020

Int J Communication

Self Cite

View full text Add to dashboard Cite

In a multicarrier continuous-variable quantum key distribution (CVQKD) protocol, the information is granulated into Gaussian subcarrier CVs and the physical Gaussian link is divided into Gaussian sub-channels. Here, we propose a combined mathematical framework of order statistics and random matrix theory for multicarrier continuous-variable quantum key distribution. The analysis covers the study of the distribution of the sub-channel transmittance coefficients in the presence of a Gaussian noise and the utilization of the moment generation function (MGF) in the error analysis. We reveal the mathematical formalism of sub-channel selection and formulation of the transmittance coefficients and show a reduced complexity progressive sub-channel scanning method. We define a framework to evaluate the statistical properties of the information flowing processes in multicarrier CVQKD protocols. Using random matrix theory, we express the achievable secret key rates and study the efficiency of the adaptive multicarrier quadrature division-multiuser quadrature allocation (AMQD-MQA) multiple-access multicarrier CVQKD. The proposed combined framework is particularly convenient for the characterization of the physical processes of experimental multicarrier CVQKD. KEYWORDS cryptography, networking, quantum cryptography, quantum key distribution, security INTRODUCTIONThe continuous-variable quantum key distribution (CVQKD) protocols 1 allow the establishment of an unconditional secure communication 2 over standard, currently established telecommunication networks. Another motivation behind the use of CVQKD is the development of the quantum Internet 10,44,58 and quantum computers 59-64 . In a CVQKD Abbreviations: AMQD, adaptive multicarrier quadrature division; AWGN, additive white Gaussian noise; BS, beam splitter

show abstract

Secret key rates of free‐space optical continuous‐variable quantum key distribution

Cited by 8 publications

References 46 publications

Optimised Multithreaded CV-QKD Reconciliation for Global Quantum Networks

Optimised Multithreaded CV-QKD Reconciliation for Global Quantum Networks

Parameter estimation for free-space continuous variable quantum key distribution based on PointNet

Order statistics and random matrix theory of multicarrier continuous‐variable quantum key distribution

Contact Info

Product

Resources

About