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arXiv:1209.6178 · Physical Review Letters

Experimental Measurement-Device-Independent Quantum Key Distribution

Yang Liu, Teng‐Yun Chen, Liujun Wang, Hao Liang, Guo-Liang Shentu, Jian Wang, Ke Cui, Hua‐Lei Yin, Nai-Le Liu, Li Li, Xiongfeng Ma, Jason S. Pelc, M. M. Fejer, Cheng-Zhi Peng, Qiang Zhang, Jian-Wei Pan

Published Sep 23, 2013• 443 citations

Abstract

Quantum key distribution is proven to offer unconditional security in communication between two remote users with ideal source and detection. Unfortunately, ideal devices never exist in practice and device imperfections have become the targets of various attacks. By developing up-conversion single-photon detectors with high efficiency and low noise, we faithfully demonstrate the measurement-device-independent quantum-key-distribution protocol, which is immune to all hacking strategies on detection. Meanwhile, we employ the decoy-state method to defend attacks on a nonideal source. By assuming a trusted source scenario, our practical system, which generates more than a 25 kbit secure key over a 50 km fiber link, serves as a stepping stone in the quest for unconditionally secure communications with realistic devices.

DOI: 10.1103/physrevlett.111.130502

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