The relatively low key rate seems to be the major barrier to its practical use for the decoy state measurement device independent quantum key distribution (MDIQKD). We present a 4-intensity protocol for the decoy-state MDIQKD that hugely raises the key rate, especially in the case the total data size is not large. Also, calculation shows that our method makes it possible for secure private communication with fresh keys generated from MDIQKD with a delay time of only a few seconds.

王向斌, 清华大学物理系教授。于2005年发表的3强度诱骗态方法, 使得基于非理想单光子源的量子密钥分发安全距离从过去的不足10公里大幅度提高到百公里以上, 获得广泛实验证实。

2016年发表的4强度诱骗态MDIQKD方法将典型实验条件下的MDIQKD成码率提高两约个数量级, 使得该方法的成码率具有实用价值, 已经获得实验证实。