Zhou Xing-Yu, Ding Hua-Jian, Zhang Chun-Hui, Li Jian, Zhang Chun-Mei, Wang Qin
Opt Lett. 2020 Aug 1;45(15):4176-4179. doi: 10.1364/OL.398993.
Measurement-device-independent quantum key distribution (MDI-QKD) removes all detector side-channel attacks and guarantees a promising way for remote secret keys sharing. Several proof-of-principal experiments have been demonstrated to show its security and practicality. However, these practical implementations demand mostly, for example, perfect state preparation or completely characterized sources to ensure security, which are difficult to realize with prior art. Here, we investigate a three-state MDI-QKD using uncharacterized sources, with the simple requirement that the encoding state is bidimensional, which eliminates security threats from both the source flaws and detection loopholes. As a demonstration, a proof-of-principal experiment over 170 km transmission distance based on Faraday-Michelson interferometers is achieved, representing, to the best of our knowledge, the longest transmission distance recorded under the same security level.
测量设备无关量子密钥分发（MDI-QKD）消除了所有探测器侧信道攻击，并为远程共享密钥提供了一种很有前景的方法。已经进行了几个原理验证实验来证明其安全性和实用性。然而，这些实际实现大多需要例如完美的状态制备或完全表征的源来确保安全性，而这用现有技术很难实现。在此，我们研究了一种使用未表征源的三态MDI-QKD，其简单要求是编码状态为二维，这消除了源缺陷和检测漏洞带来的安全威胁。作为演示，基于法拉第 - 迈克尔逊干涉仪实现了一个在170公里传输距离上的原理验证实验，据我们所知，这代表了在相同安全级别下记录的最长传输距离。
