高速离散调制连续变量量子密钥分发系统的实验演示

Experimental demonstration of high-rate discrete-modulated continuous-variable quantum key distribution system.

作者信息

Pan Yan, Wang Heng, Shao Yun, Pi Yaodi, Li Yang, Liu Bin, Huang Wei, Xu Bingjie

出版信息

Opt Lett. 2022 Jul 1;47(13):3307-3310. doi: 10.1364/OL.456978.

Abstract

A high-rate continuous-variable quantum key distribution (CV-QKD) system based on high-order discrete modulation is experimentally investigated. With the help of the novel system scheme, effective digital signal processing (DSP) algorithms and advanced analytical security proof methods, the transmission results of 5.059 km, 10.314 km, 24.490 km, and 50.592 km are achieved for 1 GBaud optimized quantum signals. Correspondingly, the asymptotic secret key rates (SKRs) are 292.185 Mbps, 156.246 Mbps, 50.491 Mbps, and 7.495 Mbps for discrete Gaussian (DG) 64QAM, and 328.297 Mbps, 176.089 Mbps, 51.304 Mbps, and 9.193 Mbps for DG 256QAM, respectively. Under the same parameters, the achieved SKRs of DG 256QAM is almost same as ideal Gaussian modulation. In this case, the demonstrated high-rate discrete-modulated CV-QKD system has the application potential for high-speed security communication under tens of kilometers.

摘要

对基于高阶离散调制的高速连续变量量子密钥分发（CV-QKD）系统进行了实验研究。借助新颖的系统方案、有效的数字信号处理（DSP）算法和先进的解析安全证明方法，对于1 GBaud优化量子信号，实现了5.059千米、10.314千米、24.490千米和50.592千米的传输结果。相应地，离散高斯（DG）64QAM的渐近密钥率（SKR）分别为292.185 Mbps、156.246 Mbps、50.491 Mbps和7.495 Mbps，DG 256QAM的渐近密钥率分别为328.297 Mbps, 176.089 Mbps, 51.304 Mbps和9.193 Mbps。在相同参数下，DG 256QAM实现的SKR几乎与理想高斯调制相同。在这种情况下，所展示出的高速离散调制CV-QKD系统在几十千米范围内具有高速安全通信的应用潜力。