Passive decoy-state quantum key distribution using weak coherent pulses with modulator attenuation

作     者：李源 鲍皖苏 李宏伟 周淳 汪洋 Li Yuan;Bao Wan-Su;Li Hong-Wei;Zhou Chun;Wang Yang

作者机构：Zhengzhou Information Science and Technology Institute Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2015年第24卷第11期

页      面：118-124页

核心收录：

学科分类：11[军事学] 1105[军事学-军队指挥学] 07[理学] 0839[工学-网络空间安全] 08[工学] 070201[理学-理论物理] 110505[军事学-密码学] 110503[军事学-军事通信学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11304397) 

主　　题：quantum key distribution passive decoy state modulator attenuation weak coherent pulses 

摘      要：Passive decoy-state quantum key distribution is more desirable than the active one in some scenarios. It is also affected by the imperfections of the devices. In this paper, the influence of modulator attenuation on the passive decoy-state method is considered. We introduce and analyze the unbalanced Mach-Zehnder interferometer, briefly, and combining with the virtual source and imaginary unitary transformation, we characterize the passive decoy-state method using a weak coherent photon source with modulator attenuation. According to the attenuation parameter 6, the pass efficiencies are given. Then, the key generation rate can be acquired. From numerical simulations, it can be seen that modulator attenuation has a non- negligible influence on the performance of passive-state QKD protocol. Based on the research, the analysis method of virtual source and imaginary unitary transformation are preferred in analyzing passive decoy state protocol, and the passive decoy-state method is better than the active one and is close to the active vacuum ＋ weak decoy state under the condition of having the same modulator attenuation.