Photon subtraction-based continuous-variable measurement-device-independent quantum key distribution with discrete modulation over a fiber-to-water channel  

作　　者：Chao Yu Yin Li Jianzhi Ding Yun Mao Ying Guo 

机构地区：[1]School of Computer Science and Engineering,Central South University,Changsha 410083,China [2]School of Automation,Central South University,Changsha 410075,China [3]School of Computer Science,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Communications in Theoretical Physics》2022年第3期36-43,共8页理论物理通讯（英文版）

摘　　要：We propose a discrete-modulated continuous-variable measurement-device-independent quantum key distribution protocol over a fiber-to-water channel.Different from optical fibers,the underwater channel has more severe optical attenuation because of optical absorption and scattering,which reduces the maximum communication distance.To enhance the performance of the protocol,the photon subtraction operation is implemented at the modulator side.We carry out a performance simulation in two different kinds of seawater channel,and the result shows that the scheme with photon subtraction has a longer secure communication distance under certain conditions.

关 键 词：measurement-device-independent discrete modulation fiber-to-water channel continuous variable quantum key distribution 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理] TN253[电子电信—通信与信息系统]