Improving source-in-the-middle continuous-variable quantum key distribution using a heralded hybrid linear amplifier  

作　　者：伍磊鑫 冯艳艳 周健 Lei-Xin Wu;Yan-Yan Feng;Jian Zhou(College of Computer and Information Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]College of Computer and Information Engineering,Central South University of Forestry and Technology,Changsha 410004,China

出　　处：《Chinese Physics B》2023年第7期290-295,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.62201620);the Outstanding Youth Program of Education Department of Hunan(Grant No.21B0228);Changsha Municipal Natural Science Foundation(Grant No.kq2202293);Hunan Students’Platform for innovation and entrepreneurship training program(Grant No.S202210538069);the Research Fund of Central South University of Forestry and Technology(Grant No.1121001703).

摘　　要：A hybrid linear amplifier is inserted at the output of the source-in-the-middle distribution protocol to overcome the shortcomings of the transmission distance.The modified protocol aims to maintain a high key rate for long-distance transmission under high noise.It has the potential to significantly broaden the application range of the continuous variable quantum key distribution protocol.The effects of amplifier parameters and noise on the modified protocol are analyzed in detail with regard to applying it to a practical system.To make the simulation more realistic,the effect of finite size on the new protocol is taken into account.It will serve as a guideline for the future use of hybrid linear amplifiers.Different parameters can be adjusted to achieve the best performance for key rates of different quantum channels.

关 键 词：hybrid linear amplifier source-in-the-middle distribution finite-size analysis 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理] TN722[电子电信—通信与信息系统]