Li Yin, Wang Yijun, Mao Yun, Peng Weishao, Jin Di, Guo Ying
School of Automation, Central South University, Changsha 410083, China.
Entropy (Basel). 2021 Oct 24;23(11):1395. doi: 10.3390/e23111395.
An improved continuous variable quantum key distribution (CVQKD) approach based on a heralded hybrid linear amplifier (HLA) is proposed in this study, which includes an ideal deterministic linear amplifier and a probabilistic noiseless linear amplifier. The CVQKD, which is based on an amplifier, enhances the signal-to-noise ratio and provides for fine control between high gain and strong noise reduction. We focus on the impact of two types of optical amplifiers on system performance: phase sensitive amplifiers (PSA) and phase insensitive amplifiers (PIA). The results indicate that employing amplifiers, local local oscillation-based CVQKD systems can enhance key rates and communication distances. In addition, the PIA-based CVQKD system has a broader application than the PSA-based system.
本研究提出了一种基于前置混合线性放大器（HLA）的改进型连续变量量子密钥分发（CVQKD）方法，该方法包括一个理想的确定性线性放大器和一个概率性无噪声线性放大器。基于放大器的CVQKD提高了信噪比，并能在高增益和强降噪之间实现精细控制。我们重点研究了两种类型的光放大器对系统性能的影响：相位敏感放大器（PSA）和相位不敏感放大器（PIA）。结果表明，采用放大器时，基于本地振荡的CVQKD系统可以提高密钥率和通信距离。此外，基于PIA的CVQKD系统比基于PSA的系统具有更广泛的应用。
