Detector-decoy quantum key distribution without monitoring signal disturbance

Hua-Lei Yin, Yao Fu, Yingqiu Mao, and Zeng-Bing Chen

Phys. Rev. A 93, 022330 – Published 23 February 2016

Abstract

The round-robin differential phase-shift quantum key distribution protocol provides a secure way to exchange private information without monitoring conventional disturbances and still maintains a high tolerance of noise, making it desirable for practical implementations of quantum key distribution. However, photon number resolving detectors are required to ensure that the detected signals are single photons in the original protocol. Here, we adopt the detector-decoy method and give the bounds to the fraction of detected events from single photons. Utilizing the advantages of the protocol, we provide a practical method of performing the protocol with desirable performances requiring only threshold single-photon detectors.

Received 14 December 2015
Revised 2 February 2016

DOI:https://doi.org/10.1103/PhysRevA.93.022330

Physics Subject Headings (PhySH)

Quantum cryptography

Quantum Information, Science & Technology

Authors & Affiliations

Hua-Lei Yin^*, Yao Fu^†, Yingqiu Mao, and Zeng-Bing Chen^‡

Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China and The CAS Center for Excellence in QIQP and the Synergetic Innovation Center for QIQP, University of Science and Technology of China, Hefei, Anhui 230026, China

^*hlyin@mail.ustc.edu.cn
^†yaofu@mail.ustc.edu.cn
^‡zbchen@ustc.edu.cn

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Issue

Vol. 93, Iss. 2 — February 2016

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