量子密钥分配
光学
物理
多路复用
本振子
量子信道
传输(电信)
电子工程
相位噪声
电信
计算机科学
量子
量子信息
工程类
光子
量子力学
作者
Yaodi Pi,Wang Heng,Yan Pan,yun shao,Yang Li,Jie Yang,Yichen Zhang,Wei Huang,Bing-Jie Xu
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-02-27
卷期号:48 (7): 1766-1766
摘要
We experimentally demonstrated a sub-Mbps key rate Gaussian-modulated coherent-state (GMCS) continuous-variable quantum key distribution (CV-QKD) over a 100-km transmission distance. To efficiently control the excess noise, the quantum signal and the pilot tone are co-transmitted in the fiber channel based on wideband frequency and polarization multiplexing methods. Furthermore, a high-accuracy data-assisted time domain equalization algorithm is carefully designed to compensate the phase noise and polarization variation in low signal-to-noise ratio. The asymptotic secure key rate (SKR) of the demonstrated CV-QKD is experimentally calculated to be 7.55 Mbps, 1.87 Mbps, and 0.51 Mbps over a transmission distance of 50 km, 75 km, and 100 km, respectively. The experimentally demonstrated that the CV-QKD system significantly improves the transmission distance and SKR compared to the state-of-art GMCS CV-QKD experimental results, and shows the potential for long-distance and high-speed secure quantum key distribution.
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