title: Experimental measurement-device-independent quantum key distribution.
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.
authors.affiliation: Department of Modern Physics and Hefei National Laboratory for Physical Sciences at Microscale, Shanghai Branch, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Teng-Yun
authors.initials: TY
authors.lastname: Chen
authors.forename: Liu-Jun
authors.initials: LJ
authors.lastname: Wang
authors.forename: Hao
authors.initials: H
authors.lastname: Liang
authors.forename: Guo-Liang
authors.initials: GL
authors.lastname: Shentu
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Ke
authors.initials: K
authors.lastname: Cui
authors.forename: Hua-Lei
authors.initials: HL
authors.lastname: Yin
authors.forename: Nai-Le
authors.initials: NL
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Xiongfeng
authors.initials: X
authors.lastname: Ma
authors.forename: Jason S
authors.initials: JS
authors.lastname: Pelc
authors.forename: M M
authors.initials: MM
authors.lastname: Fejer
authors.forename: Cheng-Zhi
authors.initials: CZ
authors.lastname: Peng
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan