Security of the traditional quantum key distribution protocols with finite-key lengths
Bao Feng(冯宝)1,2, Hai-Dong Huang(黄海东)3, Yu-Xiang Bian(卞宇翔)1,2, Wei Jia(贾玮)1,2, Xing-Yu Zhou(周星宇)4,†, and Qin Wang(王琴)4
1 State Grid Electric Power Research Institute, Nanjing 211000, China; 2 NRGD Quantum CTEK Co., Ltd., Nanjing 211000, China; 3 State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210000, China; 4 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
Abstract Quantum key distribution (QKD) in principle can provide unconditional secure communication between distant parts. However, when finite-key length is taken into account, the security can only be ensured within certain security level. In this paper, we adopt the Chernoff bound analysis method to deal with finite-key-size effects, carrying out corresponding investigations on the relationship between the key generation rate and security parameters for different protocols, including BB84, measurement-device-independent and twin-field QKD protocols. Simulation results show that there exists a fundamental limit between the key rate and the security parameters. Therefore, this study can provide valuable references for practical application of QKD, getting a nice balance between the key generation rate and the security level.
(Parametric down conversion and production of entangled photons)
Fund: Project supported by the Research on Key Technology and Equipment Development of Autonomous and Controllable Lightweight Endogenous Safety of Power Monitoring System (Grant No. 5108-202118056A-0-0-00).
Bao Feng(冯宝), Hai-Dong Huang(黄海东), Yu-Xiang Bian(卞宇翔), Wei Jia(贾玮), Xing-Yu Zhou(周星宇), and Qin Wang(王琴) Security of the traditional quantum key distribution protocols with finite-key lengths 2023 Chin. Phys. B 32 030307
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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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