Quantum catalysis-assisted attenuation for improving free-space continuous-variable quantum key distribution

Zuo, Zhiyue; Wang, Yijun; Mao, Yun; Ye, Wei; Hu, Li-Yun; Huang, Duan; Guo, Ying

doi:10.1088/1361-6455/aba2fc

Cited by 12 publications

(4 citation statements)

References 45 publications

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“…[40] So far, the QC operation has been successfully used for improving the performance of the CVQKD system. [39,41] However, there is no implementation of QC in the satellite-to-submarine scene.…”

Section: Photon-catalysis-enabled Performance Improvementmentioning

confidence: 99%

Short-wave infrared continuous-variable quantum key distribution over satellite-to-submarine channels

Peng¹,

Liao²,

Zhong³

et al. 2022

Chinese Phys. B

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The trans-media transmission of quantum pulse is one of means of free-space transmission which can be applied in continuous-variable quantum key distribution (CVQKD) system. In traditional implementations for atmospheric channels, the 1500-to-1600-nm pulse is regarded as an ideal quantum pulse carrier. Whereas, the underwater transmission of this pulses tends to suffer from severe attenuation, which inevitably deteriorates the security of the whole CVQKD system. In this paper, we propose an alternative scheme for implementations of CVQKD over satellite-to-submarine channels. We estimate the parameters of the trans-media channels, involving atmosphere, sea surface and seawater and find that the short-wave infrared performs well in the above channels. The 450 nm pulse is used for generations of quantum signal carriers to accomplish quantum communications through atmosphere, sea surface and seawater channels. Numerical simulations show that the proposed scheme can achieve the transmission distance of 600 km. In addition, we demonstrate that non-Gaussian operations can further lengthen its maximal transmission distance, which contributes to the establishment of practical global quantum networks.

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Section: Photon-catalysis-enabled Performance Improvementmentioning

confidence: 99%

Short-wave infrared continuous-variable quantum key distribution over satellite-to-submarine channels

Peng¹,

Liao²,

Zhong³

et al. 2022

Chinese Phys. B

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“…Here, it is worth emphasizing that the amplitude and phase modulators are often used to directly change Alice's modulation variance [45], and such an event is deterministic. Different from these amplitude and phase modulators, the implementation of the ZPC, on the one hand, is probabilistic so that this kind of probabilistic modulation may make it difficult for Eve to steal valid information [46]. The effects of the ZPC, on the other hand, can be emulated by the Gaussian post-selection in the CVQKD system, and after Alice and Bob preserve enough data, Alice adopts the acceptance probability contributed by the ZPC to determine which data will be accepted and reveals them to Bob [47].…”

Section: Zpc-involved Mdi-cvqkd Protocol With Discrete Modulationmentioning

confidence: 99%

Enhancing discrete-modulated continuous-variable measurement-device-independent quantum key distribution via quantum catalysis

Ye¹,

Guo²,

Zhang³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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Discrete modulation can make up for the shortage of transmission distance in measurement-device-independent continuous-variable quantum key distribution (MDI-CVQKD), providing a unique advantage against all side-channel attacks but also creating a challenge for further performance improvement. Here we suggest a quantum catalysis (QC) approach for enhancing the performance of the discrete-modulated (DM) MDI-CVQKD in terms of the achievable secret key rate and lengthening the maximal transmission distance. The numerical simulation results show that the QC-based MDI-CVQKD with discrete modulation, involving a zero-photon catalysis (ZPC) operation, can not only obtain a higher secret key rate than the original DM protocol, but also contribute to a reasonable increase of the corresponding optimal variance. As for the extreme asymmetric and symmetric cases, the secret key rate and maximal transmission distance of the ZPC-involved DM MDI-CVQKD system can be further improved under the same parameters. This approach enables the system to tolerate lower reconciliation efficiency, which may provide excellent potential for practical implementations with state-of-art technology.

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“…The attenuation coefficient g is optimal for each zenith angle. In addition, the single-photon catalysis (SPC) protocol, which can be considered as another noiseless attenuation operation [34], is also plotted for comparison. We find that the NA-based scheme improves performance.…”

Section: Asymptotic Analysismentioning

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 catalysis-assisted attenuation for improving free-space continuous-variable quantum key distribution

Cited by 12 publications

References 45 publications

Short-wave infrared continuous-variable quantum key distribution over satellite-to-submarine channels

Short-wave infrared continuous-variable quantum key distribution over satellite-to-submarine channels

Enhancing discrete-modulated continuous-variable measurement-device-independent quantum key distribution via quantum catalysis

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

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