基于级联Polar码和多级译码方法的连续变量QKD数据协商协议  

Continuous-variable QKD data reconciliation protocol based on concatenated Polar coding and multistage decoding

作　　者：周晓东 王晟 张天兵 胡宗富 冯宝 肖红 ZHOU Xiaodong;WANG Sheng;ZHANG Tianbing;HU Zongfu;FENG Bao;XIAO Hong(Information and Communication Branch of State Grid Fujian Electric Power Co.Ltd.,Fuzhou 350003,China;NARI Information Communication Technology Co.Ltd.,Nanjing 211000,China;NRGD Quantum Technology Co.Ltd.,Nanjing 211000,China;College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]国网福建省电力有限公司信息通信分公司,福建福州350003 [2]南京南瑞信息通信科技有限公司,江苏南京211000 [3]南京南瑞国盾量子技术有限公司,江苏南京211000 [4]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《量子电子学报》2022年第3期411-417,共7页Chinese Journal of Quantum Electronics

基　　金：国网福建省电力有限公司科技项目,52130M19000Y。

摘　　要：数据协商是量子密钥分发(QKD)协议的重要步骤之一,其协商效率直接影响着QKD的密钥率。为此,提出一种基于级联Polar码和多级译码方法的连续变量QKD数据协商协议,该协议在多级编码调制系统的基础上,利用纠错性能更好的级联Polar码作为分量码应用到多级译码中。仿真分析了该协议的性能,结果表明所提出协议的协商效率极大提高,同时密钥的比特错误率也极大地降低,当信噪比等于0.5 dB时该协议的误比特率小于10^(-3)。研究结果对连续变量QKD的应用具有重要价值。Data reconciliation protocol is one of the important steps in quantum key distribution(QKD),and its efficiency directly affects the key rate of QKD.Therefore,a continuous variable QKD data reconciliation protocol based on concatenated polar coding and multistage decoding is proposed.Based on the multistage coded modulation system,the proposed protocol uses the concatenated Polar codes with better error correction performance as component codes in the multistage decoding.The performance of the protocol is analyzed by simulation.The simulation results show that the reconciliation efficiency of the proposed protocol is greatly improved,while the bit error rate of the key decreases greatly at the same time.When the signal-to-noise ratio is equal to 0.5 dB,the bit error rate of the protocol is less than 10^(-3).This protocol is of great value to the application of continuous-variable QKD.

关 键 词：量子光学 量子密钥分发 数据协商 级联Polar码 多级译码 

分 类 号：O431.2[机械工程—光学工程]