中国物理B ›› 2022, Vol. 31 ›› Issue (9): 90304-090304.doi: 10.1088/1674-1056/ac6dba

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Improvement of a continuous-variable measurement-device-independent quantum key distribution system via quantum scissors

Lingzhi Kong(孔令志), Weiqi Liu(刘维琪), Fan Jing(荆凡), Zhe-Kun Zhang(张哲坤), Jin Qi(齐锦), and Chen He(贺晨)   

  1. College of Information Science and Technology, Northwest University, Xi'an 710127, China
  • 收稿日期:2022-02-24 修回日期:2022-04-22 接受日期:2022-05-07 出版日期:2022-08-19 发布日期:2022-08-19
  • 通讯作者: Weiqi Liu, Chen He E-mail:vickylwq1991@nwu.edu.cn;chenhe@nwu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 62001383) and the Scientific Research Plan Project of Shaanxi Education Department (Natural Science Special Project) (Grant No. 19JK0847).

Improvement of a continuous-variable measurement-device-independent quantum key distribution system via quantum scissors

Lingzhi Kong(孔令志), Weiqi Liu(刘维琪), Fan Jing(荆凡), Zhe-Kun Zhang(张哲坤), Jin Qi(齐锦), and Chen He(贺晨)   

  1. College of Information Science and Technology, Northwest University, Xi'an 710127, China
  • Received:2022-02-24 Revised:2022-04-22 Accepted:2022-05-07 Online:2022-08-19 Published:2022-08-19
  • Contact: Weiqi Liu, Chen He E-mail:vickylwq1991@nwu.edu.cn;chenhe@nwu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 62001383) and the Scientific Research Plan Project of Shaanxi Education Department (Natural Science Special Project) (Grant No. 19JK0847).

摘要: We propose a new scheme to enhance the performance of the Gussian-modulated coherent-state continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) system via quantum scissors (QS) operation at Bob's side. As an non-deterministic amplifying setup, we firstly introduce the QS-enhanced CV-MDI-QKD protocol and then investigate the success probability of the QS operation in accordance with the equivalent one-way scheme. Afterwards, we investigate the effect of the QS operation on the proposed scheme and analyze the performance of the QS-enhanced CV-MDI-QKD system under the extreme asymmetric circumstance. Simulation results show that the QS operation can indeed improve the performance of the CV-MDI-QKD system considerably. QS-enhanced CV-MDI-QKD protocol outperforms the original CV-MDI-QKD protocol in both the maximum transmission distance and the secret key rate. Moreover, the better the performance of QS operation, the more significant the improvement of performance of the system.

关键词: measurement-device-independent, quantum key distribution, quantum scissors, performance

Abstract: We propose a new scheme to enhance the performance of the Gussian-modulated coherent-state continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) system via quantum scissors (QS) operation at Bob's side. As an non-deterministic amplifying setup, we firstly introduce the QS-enhanced CV-MDI-QKD protocol and then investigate the success probability of the QS operation in accordance with the equivalent one-way scheme. Afterwards, we investigate the effect of the QS operation on the proposed scheme and analyze the performance of the QS-enhanced CV-MDI-QKD system under the extreme asymmetric circumstance. Simulation results show that the QS operation can indeed improve the performance of the CV-MDI-QKD system considerably. QS-enhanced CV-MDI-QKD protocol outperforms the original CV-MDI-QKD protocol in both the maximum transmission distance and the secret key rate. Moreover, the better the performance of QS operation, the more significant the improvement of performance of the system.

Key words: measurement-device-independent, quantum key distribution, quantum scissors, performance

中图分类号:  (Quantum communication)

  • 03.67.Hk
03.67.Dd (Quantum cryptography and communication security) 03.67.-a (Quantum information)