Phase-Reference-Free Experiment of Measurement-Device-Independent Quantum Key Distribution.
Phase-Reference-Free Experiment of Measurement-Device-Independent Quantum Key Distribution.
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DOI：
10.1103/physrevlett.115.160502
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发表时间：
2015-10
影响因子：
8.6
通讯作者：
Chao Wang;Xiao-Tian Song;Z. Yin;Shuang Wang;Wei Chen;Chunmei Zhang;G. Guo;Z. Han
中科院分区：
文献类型：
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作者：
Chao Wang;Xiao-Tian Song;Z. Yin;Shuang Wang;Wei Chen;Chunmei Zhang;G. Guo;Z. Han
独立于测量设备的量子密钥分发(MDI QKD)是实现远程合法用户(Alice和Bob)之间密钥共享的实用信息论安全的重要一步。与其他标准的依赖于设备的量子密钥分发协议(例如BB84)一样，MDI QKD假定参考帧已经在Alice和Bob之间共享。在实践中，非平凡的对齐过程通常是必要的，这需要系统资源，并且可能显著降低安全密钥生成率。在这里，我们提出了一种与参考帧无关的相位编码MDI量子密钥分发方案，该方案不需要在两个相距较远的合法各方的干涉仪之间进行相位对准。作为演示，给出了使用法拉第-迈克尔逊干涉仪的原理验证实验。实验系统的工作频率为1 MHz，在爱丽丝和鲍勃之间的光纤长度为20公里时，获得了平均8.309 bps的密钥速率。在没有相位补偿的情况下，系统在正常情况下可以保持正的密钥生成率。实验结果证明了该系统在成熟的MDI QKD设备中应用的可行性及其在网络场景中的应用价值。
Measurement-device-independent quantum key distribution (MDI QKD) is a substantial step toward practical information-theoretic security for key sharing between remote legitimate users (Alice and Bob). As with other standard device-dependent quantum key distribution protocols, such as BB84, MDI QKD assumes that the reference frames have been shared between Alice and Bob. In practice, a nontrivial alignment procedure is often necessary, which requires system resources and may significantly reduce the secure key generation rate. Here, we propose a phase-coding reference-frame-independent MDI QKD scheme that requires no phase alignment between the interferometers of two distant legitimate parties. As a demonstration, a proof-of-principle experiment using Faraday-Michelson interferometers is presented. The experimental system worked at 1 MHz, and an average secure key rate of 8.309 bps was obtained at a fiber length of 20 km between Alice and Bob. The system can maintain a positive key generation rate without phase compensation under normal conditions. The results exhibit the feasibility of our system for use in mature MDI QKD devices and its value for network scenarios.