Sending-or-Not-Sending Twin-Field Quantum Key Distribution with a Passive Decoy-State Method |
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| Authors: | Ke Xue Zhigang Shen Shengmei Zhao Qianping Mao |
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| Institution: | 1.Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210003, China; (K.X.); (Z.S.);2.Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing 210003, China;3.College of Computer Science and Technology, Nanjing Tech University, Nanjing 211816, China |
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| Abstract: | Twin-field quantum key distribution (TF-QKD) has attracted considerable attention because it can exceed the basic rate-distance limit without quantum repeaters. Its variant protocol, sending or not-sending quantum key distribution (SNS-QKD), not only fixes the security vulnerability of TF-QKD, but also can tolerate large misalignment errors. However, the current SNS-QKD protocol is based on the active decoy-state method, which may lead to side channel information leakage when multiple light intensities are modulated in practice. In this work, we propose a passive decoy-state SNS-QKD protocol to further enhance the security of SNS-QKD. Numerical simulation results show that the protocol not only improves the security in source, but also retains the advantages of tolerating large misalignment errors. Therefore, it may provide further guidance for the practical application of SNS-QKD. |
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| Keywords: | sending-or-not-sending passive decoy-state quantum key distribution |
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