Experimental Demonstration of High-Rate Measurement-Device-Independent Quantum Key Distribution over Asymmetric Channels

Hui Liu, Wenyuan Wang, Kejin Wei, Xiao-Tian Fang, Li Li, Nai-Le Liu, Hao Liang, Si-Jie Zhang, Weijun Zhang, Hao Li, Lixing You, Zhen Wang, Hoi-Kwong Lo, Teng-Yun Chen, Feihu Xu, and Jian-Wei Pan
Phys. Rev. Lett. 122, 160501 – Published 26 April 2019
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Abstract

Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate all detector side channels and it is practical with current technology. Previous implementations of MDI-QKD all used two symmetric channels with similar losses. However, the secret key rate is severely limited when different channels have different losses. Here we report the results of the first high-rate MDI-QKD experiment over asymmetric channels. By using the recent 7-intensity optimization approach, we demonstrate>10×higher key rate than the previous best-known protocols for MDI-QKD in the situation of large channel asymmetry, and extend the secure transmission distance by more than 20–50 km in standard telecom fiber. The results have moved MDI-QKD towards widespread applications in practical network settings, where the channel losses are asymmetric and user nodes could be dynamically added or deleted.

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  • Received 6 September 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.160501

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Hui Liu1,2,*, Wenyuan Wang3,*, Kejin Wei1,2, Xiao-Tian Fang1,2, Li Li1,2, Nai-Le Liu1,2, Hao Liang1,2, Si-Jie Zhang1,2, Weijun Zhang4, Hao Li4, Lixing You4, Zhen Wang4, Hoi-Kwong Lo3, Teng-Yun Chen1,2, Feihu Xu1,2, and Jian-Wei Pan1,2

  • 1Shanghai Branch, Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai 201315, China
  • 2CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, People’s Republic of China
  • 3Centre for Quantum Information and Quantum Control (CQIQC), Department of Electrical & Computer Engineering and Department of Physics, University of Toronto, Toronto, Ontario M5S 3G4, Canada
  • 4State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

  • *These author contributed equally to this work.

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Issue

Vol. 122, Iss. 16 — 26 April 2019

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