Improvement and security analysis of multi-ring discrete modulation continuous variable quantum secret sharing scheme  

作　　者：姜欢窈 聂敏 杨光 孙爱晶 张美玲 裴昌幸 Huan-Yao Jiang;Min Nie;Guang Yang;Ai-Jing Sun;Mei-Ling Zhang;Chang-Xing Pei(School of Communications and Information Engineering&School of Artificial Intelligence,Xi'an University of Posts and Telecommunications,Xi'an 710121,China;State Key Laboratory of Integrated Service Networks,Xidian University,Xi'an 710071,China)

机构地区：[1]School of Communications and Information Engineering&School of Artificial Intelligence,Xi'an University of Posts and Telecommunications,Xi'an 710121,China [2]State Key Laboratory of Integrated Service Networks,Xidian University,Xi'an 710071,China

出　　处：《Chinese Physics B》2024年第7期189-197,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61971348 and 61201194)。

摘　　要：In order to avoid the complexity of Gaussian modulation and the problem that the traditional point-to-point communication DM-CVQKD protocol cannot meet the demand for multi-user key sharing at the same time, we propose a multi-ring discrete modulation continuous variable quantum key sharing scheme(MR-DM-CVQSS). In this paper, we primarily compare single-ring and multi-ring M-symbol amplitude and phase-shift keying modulations. We analyze their asymptotic key rates against collective attacks and consider the security key rates under finite-size effects. Leveraging the characteristics of discrete modulation, we improve the quantum secret sharing scheme. Non-dealer participants only require simple phase shifters to complete quantum secret sharing. We also provide the general design of the MR-DM-CVQSS protocol.We conduct a comprehensive analysis of the improved protocol's performance, confirming that the enhancement through multi-ring M-PSK allows for longer-distance quantum key distribution. Additionally, it reduces the deployment complexity of the system, thereby increasing the practical value.

关 键 词：discrete modulation continuous variable quantum secret sharing scheme 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]