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Experimental Realization of 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 Jan 1, 2013• 0 citations
Publisher

Abstract

We report a complete experimental realization of measurement device independent quantum key distribution system with decoy method, which closes loopholes in both source and detection. 25-kbit secure key is generated over a 50-km fiber link.
DOI
10.1364/cleo_qels.2013.qtu2c.5

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To increase dramatically the distance and the secure key generation rate of quantum key distribution (QKD), the idea of quantum decoys--signals of different intensities--has recently been proposed. Here, we present the first experimental implementation of decoy state QKD. By making simple modifications to a commercial quantum key distribution system, we show that a secure key generation rate of 165 bit/s, which is 1/4 of the theoretical limit, can be obtained over 15 km of a telecommunication fiber. We also show that with the same experimental parameters, not even a single bit of secure key can be extracted with a non-decoy-state protocol. Compared to building single photon sources, decoy state QKD is a much simpler method for increasing the distance and key generation rate of unconditionally secure QKD.