Li Zhenhua, Liu Hongwei, Wang Jipeng, Yang Shunyu, Dou Tianqi, Qu Wenxiu, Zhou Fen, Huang Yuqing, Sun Zhongqi, Han Yanxin, Miao Guoxing, Ma Haiqiang
Opt Lett. 2020 Nov 15;45(22):6334-6337. doi: 10.1364/OL.403481.
The source flaw associated with the basis vector in the reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) has not been systematically studied. As a result, it is often assumed that bit error is equal to phase error, which is not theoretically rigorous. Here, we propose a postprocessing method to estimate the phase error rate from the discarded mismatched-basis statistics, where the qubit source does not need to be characterized in detail. The source flaw in the basis vector of the RFI-MDI-QKD protocol can thus be corrected using this method. The numerical simulation results clearly demonstrate that the RFI-MDI-QKD protocol with uncharacterized sources is also insensitive to the misalignment of the reference frame.
与参考系无关测量设备无关量子密钥分发（RFI-MDI-QKD）中基矢相关的源缺陷尚未得到系统研究。因此，人们常常假定误码等于相位误差，这在理论上并不严谨。在此，我们提出一种后处理方法，可根据丢弃的不匹配基统计量来估计相位误差率，其中量子比特源无需详细表征。利用该方法可校正RFI-MDI-QKD协议基矢中的源缺陷。数值模拟结果清楚地表明，源未表征的RFI-MDI-QKD协议对参考系的失准也不敏感。
