Phase-matching quantum key distribution with light source monitoring
Wen-Ting Li(李文婷)1, Le Wang(王乐)1,2, Wei Li(李威)1,2, and Sheng-Mei Zhao(赵生妹)1,2,†
1 Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China; 2 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing 210003, China
Abstract The transmission loss of photons during quantum key distribution (QKD) process leads to the linear key rate bound for practical QKD systems without quantum repeaters. Phase matching quantum key distribution (PM-QKD) protocol, an novel QKD protocol, can overcome the constraint with a measurement-device-independent structure, while it still requires the light source to be ideal. This assumption is not guaranteed in practice, leading to practical secure issues. In this paper, we propose a modified PM-QKD protocol with a light source monitoring, named PM-QKD-LSM protocol, which can guarantee the security of the system under the non-ideal source condition. The results show that our proposed protocol performs almost the same as the ideal PM-QKD protocol even considering the imperfect factors in practical systems. PM-QKD-LSM protocol has a better performance with source fluctuation, and it is robust in symmetric or asymmetric cases.
(Measurements common to several branches of physics and astronomy)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.61871234 and 62001249) and Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics,Tsinghua University (Grant No.KF201909).
Wen-Ting Li(李文婷), Le Wang(王乐), Wei Li(李威), and Sheng-Mei Zhao(赵生妹) Phase-matching quantum key distribution with light source monitoring 2022 Chin. Phys. B 31 050310
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