Trustworthiness of measurement devices in round-robin differential-phase-shift quantum key distribution

Zhu Cao, Zhen-Qiang Yin, and Zheng-Fu Han
Phys. Rev. A 93, 022310 – Published 8 February 2016

Abstract

Round-robin differential-phase-shift quantum key distribution (RRDPS QKD) has been proposed to raise the noise tolerability of the channel. However, in practice, the measurement device in RRDPS QKD may be imperfect. Here, we show that, with these imperfections, the security of RRDPS may be damaged by proposing two attacks for RRDPS systems with uncharacterized measurement devices. One is valid even for a system with unit total efficiency, while the other is valid even when a single-photon state is sent. To prevent these attacks, either security arguments need to be fundamentally revised or further practical assumptions on the measurement device should be put.

  • Figure
  • Received 1 October 2015

DOI:https://doi.org/10.1103/PhysRevA.93.022310

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Zhu Cao1, Zhen-Qiang Yin2,3,*, and Zheng-Fu Han2,3

  • 1Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing, China
  • 2Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 3Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

  • *yinzq@ustc.edu.cn

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Issue

Vol. 93, Iss. 2 — February 2016

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