Chinese Journal of Quantum Electronics, Volume. 40, Issue 1, 112(2023)

Quantum key distribution of detector’s dead time in heralded single photon source

Yefeng HE1,2、*, Lina LI1, Qian BAI1, Sihao CHEN1, and Yuwei QIANG1
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    Considering that the quantum key distribution protocol may be affected by the detector dead time in practical applications when the photon transmission rate is too high, the relationship between the security key generation rate based on the heralded single photon source protocol and the detector dead time is explored. First, the relationship between the security key generation rate and the detector dead time is explored with or without considering the detector dead time. The results show that when the photon transmission rate is too high, the dead time of the detector will indeed affect the generation rate of security key. Then the security key generation rate is further analyzed under different detector dead time. The results show that for the same lightsource, the greater the detector dead time is, the smaller the security key generation rate is, and the relation between the limit value of the security key generation rate and the detector dead time τ is 4.2/τ.

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    HE Yefeng, LI Lina, BAI Qian, CHEN Sihao, QIANG Yuwei. Quantum key distribution of detector’s dead time in heralded single photon source[J]. Chinese Journal of Quantum Electronics, 2023, 40(1): 112

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    Paper Information

    Received: Jul. 5, 2021

    Accepted: --

    Published Online: Mar. 13, 2023

    The Author Email: Yefeng HE (yefenghe1978@163.com)

    DOI:10.3969/j.issn.1007-5461.2023.01.013

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