Abstract Mode-pairing quantum key distribution (MP-QKD) is an excellent scheme that can exceed the repeaterless rate-transmittance bound without complex phase locking. Nevertheless, MP-QKD usually needs to ensure that the communication distances of the two channels are equal. To address the problem, the asymmetric MP-QKD protocol is proposed. In this paper, we enhance the performance of the asymmetric MP-QKD protocol based on the advantage distillation (AD) method without modifying the quantum process. The simulation results show that the AD method can extend the communication distance by about 70 km in the case of asymmetry. And we observe that as the misalignment error increases, the AD method further increases the expandable communication distance. Our work can further enhance the robustness and promote the practical application of the asymmetric MP-QKD.
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 China Postdoctoral Science Foundation (Grant No. 2021M691536), the Natural Science Foundation of Henan Province (Grant Nos. 202300410534 and 202300410532), and the Anhui Initiative in Quantum Information Technologies.
Corresponding Authors:
Chun Zhou
E-mail: winmaxsky@163.com
Cite this article:
Hai-Tao Wang(汪海涛), Chun Zhou(周淳), Yi-Fei Lu(陆宜飞), Chen-Peng Hao(郝辰鹏), Yan-Mei Zhao(赵燕美), Yan-Yang Zhou(周砚扬), Hong-Wei Li(李宏伟), and Wan-Su Bao(鲍皖苏) Asymmetric mode-pairing quantum key distribution with advantage distillation 2025 Chin. Phys. B 34 040305
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