Practical security of wavelength-multiplexed decoy-state quantum key distribution

Zhao, Liang-Yuan; Wu, Qianjun; Qiu, Hong-Kang; Qian, Jian-Lin; Han, Zheng‐Fu

doi:10.1103/physreva.103.022429

Cited by 13 publications

(6 citation statements)

References 28 publications

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“…Clearly, the key to obtaining random samples of η(t) is to acquire a random implementation of the phase screen φ(r, θ). Due to the advantageous feature of integration over θ, we have opted for sparse-spectrum-based method [31] to generate the phase screen:.…”

Section: Discussionmentioning

confidence: 99%

An intelligent threshold selection method to improve orbital angular momentum-encoded quantum key distribution under turbulence

Li,

Tang,

Wang

et al. 2024

Preprint

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The high-dimensional quantum key distribution (HD-QKD) encoded by orbital angular momentum (OAM) presents significant advantages in terms of information capacity. However, perturbations caused by free-space atmospheric turbulence introduce random fluctuations in OAM transmittance, impacting the performance of the system. Currently, there exists a gap in theoretical analysis concerning the statistical distribution of OAM-encoded QKD systems. In this study, we analyze the security of QKD systems by combining probability distribution of transmission coefficient (PDTC) of OAM with decoy-state BB84 method. To address the problem that the invalid key rate is calculated in the part transmittance interval of the post-processing process, an intelligent threshold method based on neural network is proposed to improve OAM-encoded QKD, which aims to conserve computing resources and enhance system efficiency. Our findings reveal that the ratio of root mean square (RMS) OAM-beam radius to Fried’s atmospheric coherence width plays a crucial role in ensuring secure key generation. Moreover, the training error of neural network is at the magnitude around 10 −3 , indicating the ability to predict optimization parameters quickly and accurately. This research contributes to the advancement of parameter optimization and prediction for free-space OAM-encoded HD-QKD systems. Furthermore, it provides valuable theoretical insights to support the development of free-space experimental setups.

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Section: Discussionmentioning

confidence: 99%

An intelligent threshold selection method to improve orbital angular momentum-encoded quantum key distribution under turbulence

Li,

Tang,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…When analyzing the security of HD-QKD system, it is necessary to consider the influence of finite-key effects response final security key rate caused by statistical fluctuation. Here, before giving a finite-key security analysis for OAM-encoded HD-QKD, we first review the improved Chernoff bound method used for fluctuation analysis in [65,66]. For observation ζ > 0, using the Chernoff inequality, the confidence interval for the expected value E [ζ] of the observed parameter can be obtained:…”

Section: Finite-key Security Analysis For Decoy-state Oam-encoded Hd-qkdmentioning

confidence: 99%

“…According to the above theoretical analysis, targeting 10 km free space link scenarios, the simulation method is used to analyze the influence of different factors on OAM-encoded HD-QKD system. The main parameters for simulation are as follows in table 1 [65,67]:…”

Section: Numerical Simulationsmentioning

confidence: 99%

State-dependent misalignment and turbulence effects on high-dimensional quantum key distribution with orbital angular momentum

Li,

Wang,

et al. 2024

New J. Phys.

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High-dimensional quantum key distribution (HD-QKD) is a topic of growing interest in the quantum communication community, not only for its inherent properties but also for its possible applications. As the typical freedom in HD-QKD, orbital angular momentum (OAM) has made significant advancements in experiments recently. However, in the airborne scenario, different states suffer different amounts of misalignment and turbulence. A complete theoretical analysis model for the transmission characteristics of OAM in atmospheric channels is lacking. In this paper, we systematically analyze the extent to which degeneration including channel power loss and mode crosstalk are influenced by misalignment and turbulence effects. Furthermore, the performance of OAM-encoded HD-QKD system in different dimensions is evaluated while incorporating finite-key effects. We demonstrate that the performance of OAM-encoded HD-QKD will be better at short range, which provide a reference to implement QKD based on task requirements. Since OAM is desired to increase the capacity of QKD system and experiments have already been carried out, our work can not only bridge the gap between theory and practice, but also optimize experimental parameters and improve system performance.

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“…However, we use these devices in an information security system designed to ensure secrecy due to nature's laws. Significant errors in determining the detection probability lead to the fact that the entire QKD system's parameters become more difficult to predict and acquire significant errors [11]. For example, an incorrectly determined detection probability can lead to the fact that the system's absolute security will be an order of magnitude lower than expected.…”

Section: Introductionmentioning

confidence: 99%

Investigating the coherent state detection probability of InGaAs/InP SPAD-based single-photon detectors

Koziy,

Tayduganov,

Losev

et al. 2021

Preprint

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In this work we investigate the probabilities of detecting single-and multi-photon coherent states on InGaAs/InP sine-gated and free-run single-photon avalanche diodes. As a result, we conclude that multi-photon state detection cannot be regarded as independent events of absorption of individual single-photon states. However, if a greater number of states are one-and two-photon, then an Independent model is permissible. We conclude that physical processes must occur in the diode structure, determining the correlation when several photons are absorbed simultaneously. We present two models that we can use to describe photon interactions in a structure. The Dependent model is based on an increase/decrease in the probability of detecting an n th photon upon an unfortunate detection of an (n − 1) th photon in an n-photon state and is well physically grounded; The Empirical model offers a simple and accurate empirical relationship.

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Practical security of wavelength-multiplexed decoy-state quantum key distribution

Cited by 13 publications

References 28 publications

An intelligent threshold selection method to improve orbital angular momentum-encoded quantum key distribution under turbulence

An intelligent threshold selection method to improve orbital angular momentum-encoded quantum key distribution under turbulence

State-dependent misalignment and turbulence effects on high-dimensional quantum key distribution with orbital angular momentum

Investigating the coherent state detection probability of InGaAs/InP SPAD-based single-photon detectors

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