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  • Received: Jul. 28, 2020

    Accepted: Sep. 15, 2020

    Posted: Dec. 1, 2020

    Published Online: Nov. 23, 2020

    The Author Email: Zhao Yankun (1364853816@qq.com)

    DOI: 10.3788/AOS202040.2427001

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    Yefeng He, Yankun Zhao, Chunyu Li, Jiarui Guo. Measurement-Device-Independent Quantum Key Distribution of Finite Detector's Dead Time in Heralded Pair Coherent State[J]. Acta Optica Sinica, 2020, 40(24): 2427001

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Acta Optica Sinica, Vol. 40, Issue 24, 2427001 (2020)

Measurement-Device-Independent Quantum Key Distribution of Finite Detector's Dead Time in Heralded Pair Coherent State

He Yefeng1,3, Zhao Yankun2,*, Li Chunyu2, and Guo Jiarui1

Author Affiliations

  • 1School of Cyberspace Security, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121, China
  • 2School of Communication and Information Engineering, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121, China
  • 3Guangxi Key Laboratory of Cryptography and Information Security, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

Abstract

In its practical applications, quantum key distribution is affected by the finite detector dead time. When the signal pulse transmission rate is too large, the probability of detector's measurement failure increases and the security key generation rate decreases. In this paper, the finite detector dead time problem is analyzed for measurement-device-independent quantum key distribution under the heralded pair coherent state photon source. The relationship between the security key generation rate and the signal transmission rate is studied and simulated. Considering the detector's dead time, the secure key generation rate of the measurement-device-independent quantum key distribution protocol based on the heralded pair coherent state photon source is higher than that of the measurement-device-independent quantum key distribution protocol based on the weak coherent state photon source. In addition, the security key generation rates are analyzed with the respective finite detector's dead time τ of 50, 100, and 150 ns. The results show that the higher the detector's dead time is, the lower the limit value of the security key generation rate is. The relation between the limit value of the security key generation rate and the finite detector's dead time is 8.1×10 3.

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