Abstract The robustness of reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) against detection system vulnerabilities and its tolerance to reference frame drifts make it an ideal choice for hybrid channels. However, the impact of atmospheric turbulence on transmittance fluctuations remains a significant challenge for enhancing the performance of RFI-MDI-QKD. In this paper, we apply prefixed-threshold real-time selection and advantage distillation techniques to RFI-MDI-QKD in a hybrid channels scenario. Then, we analytically derive formulas for secret key rate in hybrid channels. Simulation results show that our modified scheme has apparent advances in both maximum tolerant loss and secure key rate compared to the fiber-only channel. Specifically, the result demonstrates that the maximum transmission distance can be improved by 15 km and 28 km when and . Our work not only provides a more robust key distribution protocol but also establishes a solid theoretical foundation for enhancing the performance of RFI-MDI-QKD in hybrid channels.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61505261, 62101597, 61605248, and 61675235), the National Key Research and Development Program of China (Grant No. 2020YFA0309702),the Natural Science Foundation of Henan Province (Grant Nos. 202300410534 and 202300410534), and the Anhui Initiative in Quantum Information Technologies.
Corresponding Authors:
Chun Zhou, Wan-Su Bao
E-mail: winmaxsky@163.com;bws@qiclab.cn
Cite this article:
Yan-Mei Zhao(赵燕美), Chun Zhou(周淳), Xiao-Lei Jiang(姜晓磊), Yi-Fei Lu(陆宜飞), Yu Zhou(周雨), Hai-Tao Wang(汪海涛), Yang Wang(汪洋), Jia-Ji Li(李家骥), Yan-Yang Zhou(周砚扬), Hong-Wei Li(李宏伟), and Wan-Su Bao(鲍皖苏) Improving the performance of reference-frame-independent measurement-device-independent quantum key distribution in hybrid channels 2025 Chin. Phys. B 34 050302
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Research progress in quantum key distribution Chun-Xue Zhang(张春雪), Dan Wu(吴丹), Peng-Wei Cui(崔鹏伟), Jun-Chi Ma(马俊驰),Yue Wang(王玥), and Jun-Ming An(安俊明). Chin. Phys. B, 2023, 32(12): 124207.
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