Wang Chao, Wang Shuang, Yin Zhen-Qiang, Chen Wei, Li Hong-Wei, Zhang Chun-Mei, Ding Yu-Yang, Guo Guang-Can, Han Zheng-Fu
Opt Lett. 2016 Dec 1;41(23):5596-5599. doi: 10.1364/OL.41.005596.
Measurement-device-independent quantum key distribution (MDI QKD) is an efficient way to share secrets using untrusted measurement devices. However, the assumption on the characterizations of encoding states is still necessary in this promising protocol, which may lead to unnecessary complexity and potential loopholes in realistic implementations. Here, by using the mismatched-basis statistics, we present the first proof-of-principle experiment of MDI QKD with uncharacterized encoding sources. In this demonstration, the encoded states are only required to be constrained in a two-dimensional Hilbert space, and two distant parties (Alice and Bob) are resistant to state preparation flaws even if they have no idea about the detailed information of their encoding states. The positive final secure key rates of our system exhibit the feasibility of this novel protocol, and demonstrate its value for the application of secure communication with uncharacterized devices.
测量设备无关量子密钥分发（MDI QKD）是一种使用不可信测量设备共享密钥的有效方法。然而，在这个有前景的协议中，对编码态特征的假设仍然是必要的，这可能会导致实际实现中不必要的复杂性和潜在漏洞。在此，通过使用失配基统计，我们展示了首个针对未表征编码源的MDI QKD原理验证实验。在这个演示中，编码态仅需被限制在二维希尔伯特空间中，并且即使两个远程方（爱丽丝和鲍勃）对其编码态的详细信息一无所知，他们也能抵御态制备缺陷。我们系统最终的正安全密钥率展示了这个新协议的可行性，并证明了其在使用未表征设备进行安全通信应用中的价值。
