自由空间连续变量量子密钥分发的相位补偿

Phase compensation for free-space continuous-variable quantum key distribution.

作者信息

Wang Shiyu, Huang Peng, Liu Miaomiao, Wang Tao, Wang Ping, Zeng Guihua

出版信息

Opt Express. 2020 Apr 13;28(8):10737-10745. doi: 10.1364/OE.387402.

Abstract

Large-scale and flexible deployment of quantum networks is possible with reliable free-space quantum key distribution. However, signal fading occurs in free-space channels and causes various adverse effects. Under this circumstance, phase compensation becomes a challenging task for quantum key distribution using continuous variables. Here we investigate the feasibility of implementing phase compensation via simply computing the correlation between transmitted and received data. Demonstration and performance analysis are conducted with real transmittance of a 150-m free-space fading channel; results indicate the applicability of this compensation scheme to free-space quantum communication systems.

摘要

可靠的自由空间量子密钥分发使得量子网络能够大规模且灵活地部署。然而，自由空间信道中会出现信号衰落并造成各种不利影响。在这种情况下，相位补偿对于使用连续变量的量子密钥分发而言成为一项具有挑战性的任务。在此，我们研究通过简单计算发送数据与接收数据之间的相关性来实现相位补偿的可行性。利用150米自由空间衰落信道的实际透射率进行了演示和性能分析；结果表明该补偿方案适用于自由空间量子通信系统。