Twin-field quantum key distribution with heralded single photon source

Autor: Wenxiu Qu, Shunyu Yang, Fen Zhou, Zhenhua Li, Haiqiang Ma, Jipeng Wang, Zhongqi Sun, Guo-Xing Miao, Tianqi Dou
Rok vydání: 2020
Předmět:
Zdroj: The European Physical Journal D. 74
ISSN: 1434-6079
1434-6060
Popis: The recently proposed twin-field quantum key distribution (TF-QKD) effectively overcomes the key capacity limitation without quantum relay and achieves long-distance quantum key distribution. In this paper, based on the TF-QKD protocol by Lucamarini et al. [M. Lucamarini, Z.L. Yuan, J.F. Dynes, A.J. Shields, Nature 557, 400 (2018)], we propose a scheme where the weak coherent state (WCS) is replaced by a heralded single photon source (HSPS), and compare their performance by calculating the key rate. The numerical simulation results show that TF-QKD using HSPS can still break through the rate-distance limitation. Specifically, compared with the WCS TF-QKD protocol, the HSPS TF-QKD protocol has a lower secret key rate but a greater distance. Thus we show the TF-QKD with HSPS is a more preferable protocol for long distance transmittance.
Databáze: OpenAIRE
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