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Measurement-Device-Independent Quantum Key Distribution Over a 404 km Optical Fiber

Hua-Lei Yin, Teng-Yun Chen, Zong-Wen Yu, Hui Liu, Li-Xing You, Yi-Heng Zhou, Si-Jing Chen, Yingqiu Mao, Ming-Qi Huang, Wei-Jun Zhang, Hao Chen, Ming Jun Li, Daniel Nolan, Fei Zhou, Xiao Jiang, Zhen Wang, Qiang Zhang, Xiang-Bin Wang, and Jian-Wei Pan
Phys. Rev. Lett. 117, 190501 – Published 2 November 2016
Physics logo See Synopsis: Quantum Cryptography Goes a Long Way
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Abstract

Measurement-device-independent quantum key distribution (MDIQKD) with the decoy-state method negates security threats of both the imperfect single-photon source and detection losses. Lengthening the distance and improving the key rate of quantum key distribution (QKD) are vital issues in practical applications of QKD. Herein, we report the results of MDIQKD over 404 km of ultralow-loss optical fiber and 311 km of a standard optical fiber while employing an optimized four-intensity decoy-state method. This record-breaking implementation of the MDIQKD method not only provides a new distance record for both MDIQKD and all types of QKD systems but also, more significantly, achieves a distance that the traditional Bennett-Brassard 1984 QKD would not be able to achieve with the same detection devices even with ideal single-photon sources. This work represents a significant step toward proving and developing feasible long-distance QKD.

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  • Received 30 June 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.190501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Synopsis

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Quantum Cryptography Goes a Long Way

Published 2 November 2016

A protocol for secure quantum communications has been demonstrated over a record-breaking distance of 404 km.

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Authors & Affiliations

Hua-Lei Yin1,2, Teng-Yun Chen1,2, Zong-Wen Yu3,4, Hui Liu1,2, Li-Xing You5, Yi-Heng Zhou2,3, Si-Jing Chen5, Yingqiu Mao1,2, Ming-Qi Huang1,2, Wei-Jun Zhang5, Hao Chen6, Ming Jun Li6, Daniel Nolan6, Fei Zhou7, Xiao Jiang1,2, Zhen Wang5, Qiang Zhang1,2,7,*, Xiang-Bin Wang2,3,7,†, and Jian-Wei Pan1,2,‡

  • 1National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 3State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
  • 4Data Communication Science and Technology Research Institute, Beijing 100191, China
  • 5State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 6Corning Incorporated, Corning, New York 14831, USA
  • 7Jinan Institute of Quantum Technology, Jinan, Shandong 250101, China

  • *qiangzh@ustc.edu.cn
  • xbwang@mail.tsinghua.edu.cn
  • pan@ustc.edu.cn

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Issue

Vol. 117, Iss. 19 — 4 November 2016

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