Jing Fan, Liu Weiqi, Kong Lingzhi, He Chen
College of Information Science and Technology, Northwest University, Xi'an 710127, China.
Entropy (Basel). 2021 Dec 16;23(12):1691. doi: 10.3390/e23121691.
In the continuous variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol, both Alice and Bob send quantum states to an untrusted third party, Charlie, for detection through the quantum channel. In this paper, we mainly study the performance of the CV-MDI-QKD system using the noiseless linear amplifier (NLA). The NLA is added to the output of the detector at Charlie's side. The research results show that NLA can increase the communication distance and secret key rate of the CV-MDI-QKD protocol. Moreover, we find that the more powerful the improvement of the performance with the longer gain of NLA and the optimum gain is given under different conditions.
在连续变量测量设备无关量子密钥分发（CV-MDI-QKD）协议中，爱丽丝和鲍勃都通过量子信道将量子态发送给一个不可信的第三方查理进行检测。在本文中，我们主要研究使用无噪声线性放大器（NLA）的CV-MDI-QKD系统的性能。NLA被添加到查理端探测器的输出端。研究结果表明，NLA可以增加CV-MDI-QKD协议的通信距离和密钥率。此外，我们发现随着NLA增益时间越长，性能提升越显著，并且在不同条件下给出了最佳增益。
