Security of the traditional quantum key distribution protocols with finite-key lengths  

作　　者：冯宝 黄海东 卞宇翔 贾玮 周星宇 王琴 Bao Feng;Hai-Dong Huang;Yu-Xiang Bian;Wei Jia;Xing-Yu Zhou;Qin Wang(State Grid Electric Power Research Institute,Nanjing 211000,China;NRGD Quantum CTEK Co.,Ltd.,Nanjing 211000,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China;Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第3期120-124,共5页中国物理B（英文版）

基　　金：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).

摘　　要：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.

关 键 词：quantum key distribution BB84 measurement-device-independent quantum key distribution twin-field quantum key distribution 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]