Reference-frame-independent quantum key distribution with random atmospheric transmission efficiency
Reference-frame-independent quantum key distribution with random atmospheric transmission efficiency
复制标题
DOI：
10.1142/s0217984920504163
复制
发表时间：
2020-09
影响因子：
1.9
通讯作者：
Yang Xue;Lei Shi;Jiahua Wei;Longqiang Yu;Huicun Yu;Jie Tang
中科院分区：
文献类型：
--
作者：
Yang Xue;Lei Shi;Jiahua Wei;Longqiang Yu;Huicun Yu;Jie Tang
参考帧无关的量子密钥分配（RFI-QKD）已被证明对未知的参考帧失准具有良好的容忍性，在实现全球量子通信方面具有广阔的应用前景。然而，很少有工作已经解决了在湍流大气信道中的RFI-QKD的性能和可行性。在这里，我们建议在实际的自由空间链路中实现RFI-QKD，由于光束漂移和展宽，传输效率会波动。提出了一种改进的单光子接收效率概率分布估计模型，并在此基础上对高斯光束光斑演化和保密密钥率进行了仿真。结果表明，波束漂移传输效率的概率分布模型是合理的，以提高RFI-QKD在自由空间信道中的性能。
Reference-frame-independent quantum key distribution (RFI-QKD) has been proved to be tolerant against unknown reference frame misalignment, which reserves interesting prospects in implementing global quantum communication. However, few works have been addressed on the performance and feasibility for RFI-QKD in turbulent atmospheric channels. Here, we propose to implement RFI-QKD in practical free-space links with fluctuating transmission efficiency due to beam wandering and broadening. An improved model for estimating the probability distribution of single-photon receiving efficiency has been developed and we also simulated the Gaussian beam spot evolution and secure key rate based on that. Results show that the beam wandering model of probability distribution of transmission efficiency is reasonable to improve the performance of RFI-QKD in free-space channel.