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Prefixed-threshold real-time selection for correlated turbulent channel model for quantum key distribution with modulating retro-reflectors

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Abstract

Free-space quantum key distribution (QKD) with modulating retro-reflectors (MRR) is adopted to simplify the pointing requirements in practical experiment, which has the potential for mobile and flexible QKD platforms. However, this protocol suffers double-pass weak turbulence that may affect the performance of the QKD experiment in free-space links. In this paper, the free-space QKD with MRR under double-pass correlated turbulent channel is analyzed to examine the relationship between system performance and two parameters of the fading correlation coefficient and the turbulence intensity. The threshold post-selection method (P-RTS) is extended to MRR-QKD scheme under correlated turbulent channel and the simulations show that the P-RTS method is effective to alleviate the effect of atmospheric turbulence and suitable for the situation of double-pass correlated turbulent channel to make the protocol more practical in actual environment.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 11704412), Key Research and Development Program of Shaanxi (Program No. 2019ZDLGY09-01), Innovative Talents Promotion Plan in Shaanxi Province (Grant No. 2020KJXX-011) and Key Program of National University of Defense Technology (19-QNCXJ-009). We thank Wenyuan Gu, Ying Liu and Ding Yang for helpful discussions.

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Authors and Affiliations

  1. School of Information and Navigation, Air Force Engineering University, Xi’an, 710077, China

    Xing-Yu Wang & Shang-Hong Zhao

  2. Information and Communication College, National University of Defense Technology, Xi’an, 710006, China

    Xing-Yu Wang, Tian-Yi Wu & Chen Dong

  3. No. 75835 Unit of PLA, Guangzhou, 510510, China

    Ying Sun

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  1. Xing-Yu Wang
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  2. Tian-Yi Wu
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Correspondence to Chen Dong.

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Wang, XY., Wu, TY., Dong, C. et al. Prefixed-threshold real-time selection for correlated turbulent channel model for quantum key distribution with modulating retro-reflectors. Quantum Inf Process 20, 44 (2021). https://doi.org/10.1007/s11128-020-02981-2

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