Improvement of a continuous-variable measurement-device-independent quantum key distribution system via quantum scissors  

作　　者：Lingzhi Kong Weiqi Liu Fan Jing Zhe-Kun Zhang Jin Qi Chen He 孔令志;刘维琪;荆凡;张哲坤;齐锦;贺晨(College of Information Science and Technology,Northwest University,Xi'an 710127,China)

机构地区：[1]College of Information Science and Technology,Northwest University,Xi'an 710127,China

出　　处：《Chinese Physics B》2022年第9期202-207,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.62001383);the Scientific Research Plan Project of Shaanxi Education Department(Natural Science Special Project)(Grant No.19JK0847).

摘　　要：We propose a new scheme to enhance the performance of the Gussian-modulated coherent-state continuous-variable measurement-device-independent quantum key distribution(CV-MDI-QKD)system via quantum scissors(QS)operation at Bob's side.As an non-deterministic amplifying setup,we firstly introduce the QS-enhanced CV-MDI-QKD protocol and then investigate the success probability of the QS operation in accordance with the equivalent one-way scheme.Afterwards,we investigate the effect of the QS operation on the proposed scheme and analyze the performance of the QS-enhanced CV-MDI-QKD system under the extreme asymmetric circumstance.Simulation results show that the QS operation can indeed improve the performance of the CV-MDI-QKD system considerably.QS-enhanced CV-MDI-QKD protocol outperforms the original CV-MDI-QKD protocol in both the maximum transmission distance and the secret key rate.Moreover,the better the performance of QS operation,the more significant the improvement of performance of the system.

关 键 词：measurement-device-independent quantum key distribution quantum scissors performance 

分 类 号：O413[理学—理论物理] TN918[理学—物理]