Discretely modulated continuous-variable quantum key distribution with an untrusted entanglement source

Liao, Qin; Xiao, Gang; Xu, Chong‐Yu; Xu, Yang; Guo, Ying

doi:10.1103/physreva.102.032604

Cited by 38 publications

(17 citation statements)

References 23 publications

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“…Besides, γ A 1 F 1 F 2 B 2 can be obtained by rearranging the elements in γ A 1 B 2 F 1 F 2 shown in Equation (18). Therefore, the key rate over a fast-fading channel can be determined using Equation (9).…”

Section: The Secret Key Rate Of Conventional Detector Model Against F...mentioning

confidence: 99%

“…Due to development over the last three decades, QKD can be divided into discrete-variable QKD based on single photon detection, and continuous-variable QKD (CV-QKD) based on coherent detection [4][5][6][7]. Due to the simpler detection method, CV-QKD has higher compatibility with the existing optical communication systems [8], and the transmission distance achieved recently can support the requirement in metropolitan distances [9,10], which facilitates the large-scale application of QKD [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

et al. 2022

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Free-space continuous-variable quantum key distribution based on atmospheric laser communications is expected to play an important role in the global continuous-variable quantum key distribution network. The practical homodyne detector model is applied in free-space continuous-variable quantum key distribution which models the imperfect characteristics including the detection efficiency and the electronic noise. In the conventional model, we must calibrate them simultaneously. In the modified model, only one of the imperfections needs to be calibrated to simplify the calibration process of the practical experiments, also known as one-time calibration. The feasibility of the modified detector model against the fast-fading channel is proved. The results of the symmetry operations are considered when presenting detailed security analysis. Some remarkable features of the uniform fast-fading channel were found from the simulation results. The performances of the conventional model and the modified model are similar but the modified model has the advantage of achieving one-time calibration.

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Section: The Secret Key Rate Of Conventional Detector Model Against F...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the asymptotic case mentioned above, the secure analysis is performed with the premise that the length of the data is infinite, which is impossible in practice. Therefore, considering the finite-size effect in security analysis is necessary for practical implementations [38][39][40]. In the finite-size regime, we need to estimate the unknown parameters, including the channel transmittance and channel noise.…”

Section: Finite-size Regimementioning

confidence: 99%

Noiseless Attenuation for Continuous-Variable Quantum Key Distribution over Ground-Satellite Uplink

Yin

Wang

et al. 2021

Applied Sciences

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Satellite-based quantum key distribution (QKD) has lately received considerable attention due to its potential to establish a secure global network. Associated with its application is a turbulent atmosphere that sets a notable restriction to the transmission efficiency, which is especially challenging for ground-to-satellite uplink scenarios. Here, we propose a novel noiseless attenuation (NA) scheme involving a zero-photon catalysis operation for source preparation to improve the performance of continuous-variable (CV) QKD over uplink. Numerical analysis shows that the NA-based CV-QKD, under attenuation optimization, outperforms the traditional CV-QKD, which is embodied in extending the allowable zenith angle while improving the effective communication time. Attributing to characteristics of the attenuation optimization, we find that the NA-involved source preparation improves the security bound by relatively reducing the amount of information available to eavesdroppers. Taking the finite-size effect into account, we achieve a tighter bond of security, which is more practical compared with the asymptotic limit.

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“…Quantum key distribution (QKD), which allows two legal parties, Alice and Bob, to share a set of secret key, may be manipulated by an eavesdropper, called Eve [1][2][3][4][5]. Currently, discrete-variable (DV) QKD has been developed, but it still faces challenges regarding the source preparation, the detection cost, and the secret key rate [6,7]. Continuousvariable (CV) QKD is another approach to actualizing QKD [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Counteracting a Saturation Attack in Continuous-Variable Quantum Key Distribution Using an Adjustable Optical Filter Embedded in Homodyne Detector

Mao

et al. 2022

Entropy

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A saturation attack can be employed for compromising the practical security of continuous-variable quantum key distribution (CVQKD). In this paper, we suggest a countermeasure approach to resisting this attack by embedding an adjustable optical filter (AOF) in the CVQKD system. Numerical simulations illustrate the effects of the AOF-enabled countermeasure on the performance in terms of the secret key rate and transmission distance. The legal participants can trace back the information that has been eavesdropped by an attacker from the imperfect receiver, which indicates that this approach can be used for defeating a saturation attack in practical quantum communications.

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Discretely modulated continuous-variable quantum key distribution with an untrusted entanglement source

Cited by 38 publications

References 23 publications

Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

Noiseless Attenuation for Continuous-Variable Quantum Key Distribution over Ground-Satellite Uplink

Counteracting a Saturation Attack in Continuous-Variable Quantum Key Distribution Using an Adjustable Optical Filter Embedded in Homodyne Detector

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