Improved secure bounds for passive decoy state quantum key distribution system

被引：0
作者：
Fan Liu
Chun Zhou
Yang Wang
Yahui Gan
Musheng Jiang
Wansu Bao
机构：
[1] Henan Key Laboratory of Quantum Information and Cryptography,Synergetic Innovation Centre of Quantum Information and Quantum Physics
[2] SSF IEU,undefined
[3] University of Science and Technology of China,undefined
来源：
Optical and Quantum Electronics | 2020年 / 52卷
关键词：
Quantum key distribution; Passive decoy-state; Chernoff bound; Finite-size;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The decoy-state method was proposed as an effective way to resist photon-number splitting attack in quantum key distribution (QKD) system. However, due to the limitation of computing power, the final key rate of the QKD system is affected by statistical fluctuation. Until now, the key rate of active decoy-state method under statistical fluctuations has been rigorously analysed and improved by applying the improved Chernoff bound. In this paper, the improved Chernoff bound method is applied in the passive decoy-state method and an improved bound for estimating the final key rate is obtained. The simulation results show that the maximum secure transmission distance by our method can reach 205 km under standard optical fiber, which is very close to the asymptotic limit of 212 km. With a number of pulses up to 1013, our method can reach the highest final key rates among existing results, which can be considered as the best choice for QKD implementations with passive mudulation.
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