Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector

doi:10.1088/1674-1056/ac4102

中国物理B ›› 2022, Vol. 31 ›› Issue (7): 70303-070303.doi: 10.1088/1674-1056/ac4102

Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector

Lingzhi Kong(孔令志), Weiqi Liu(刘维琪)^†, Fan Jing(荆凡), and Chen He(贺晨)^‡

College of Information Science and Technology, Northwest University, Xi'an 710127, China

收稿日期:2021-09-06 修回日期:2021-11-15 接受日期:2021-12-08 出版日期:2022-06-09 发布日期:2022-07-19
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 Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM-591).

Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector

Lingzhi Kong(孔令志), Weiqi Liu(刘维琪)^†, Fan Jing(荆凡), and Chen He(贺晨)^‡

College of Information Science and Technology, Northwest University, Xi'an 710127, China

Received:2021-09-06 Revised:2021-11-15 Accepted:2021-12-08 Online:2022-06-09 Published:2022-07-19
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 Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM-591).

摘要/Abstract

摘要： When developing a practical continuous-variable quantum key distribution (CVQKD), the detector is necessary at the receiver's side. We investigate the practical security of the CVQKD system with an unbalanced heterodyne detector. The results show that unbalanced heterodyne detector introduces extra excess noise into the system and decreases the lower bound of the secret key rate without awareness of the legitimate communicators, which leaves loopholes for Eve to attack the system. In addition, we find that the secret key rate decreases more severely with the increase in the degree of imbalance and the excess noise induced by the imbalance is proportional to the intensity of the local oscillator (LO) under the same degree of imbalance. Finally, a countermeasure is proposed to resist these kinds of effects.

关键词: continuous-variable, quantum key distribution, heterodyne detector

Abstract: When developing a practical continuous-variable quantum key distribution (CVQKD), the detector is necessary at the receiver's side. We investigate the practical security of the CVQKD system with an unbalanced heterodyne detector. The results show that unbalanced heterodyne detector introduces extra excess noise into the system and decreases the lower bound of the secret key rate without awareness of the legitimate communicators, which leaves loopholes for Eve to attack the system. In addition, we find that the secret key rate decreases more severely with the increase in the degree of imbalance and the excess noise induced by the imbalance is proportional to the intensity of the local oscillator (LO) under the same degree of imbalance. Finally, a countermeasure is proposed to resist these kinds of effects.

Key words: continuous-variable, quantum key distribution, heterodyne detector

中图分类号: (Quantum communication)

03.67.Hk

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

Lingzhi Kong(孔令志), Weiqi Liu(刘维琪), Fan Jing(荆凡), and Chen He(贺晨). Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector[J]. 中国物理B, 2022, 31(7): 70303-070303.

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Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector

Practical security analysis of continuous-variable quantum key distribution with an unbalanced heterodyne detector

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