Continuous-variable quantum key distribution based on photon addition operation

doi:10.1088/1674-1056/abd931

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 60304-060304.doi: 10.1088/1674-1056/abd931

Continuous-variable quantum key distribution based on photon addition operation

Xiao-Ting Chen(陈小婷)¹, Lu-Ping Zhang(张露萍)¹, Shou-Kang Chang(常守康)¹, Huan Zhang(张欢)¹, and Li-Yun Hu(胡利云)^1,2,†

1 Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China;
2 Key Laboratory of Optoelectronic and Telecommunication, Jiangxi Normal University, Nanchang 330022, China

收稿日期:2020-12-08 修回日期:2021-01-01 接受日期:2021-01-07 出版日期:2021-05-18 发布日期:2021-06-01
通讯作者: Li-Yun Hu E-mail:hlyun@jxnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11664017 and 11964013) and the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province, China (Grant No. 20204BCJL22053).

Continuous-variable quantum key distribution based on photon addition operation

Xiao-Ting Chen(陈小婷)¹, Lu-Ping Zhang(张露萍)¹, Shou-Kang Chang(常守康)¹, Huan Zhang(张欢)¹, and Li-Yun Hu(胡利云)^1,2,†

1 Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China;
2 Key Laboratory of Optoelectronic and Telecommunication, Jiangxi Normal University, Nanchang 330022, China

Received:2020-12-08 Revised:2021-01-01 Accepted:2021-01-07 Online:2021-05-18 Published:2021-06-01
Contact: Li-Yun Hu E-mail:hlyun@jxnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11664017 and 11964013) and the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province, China (Grant No. 20204BCJL22053).

摘要/Abstract

摘要： It is shown that the non-Gaussian operations can not only be used to prepare the nonclassical states, but also to improve the entanglement degree between Gaussian states. Thus these operations are naturally considered to enhance the performance of continuous variable quantum key distribution (CVQKD), in which the non-Gaussian operations are usually placed on the right-side of the entangled source. Here we propose another scheme for further improving the performance of CVQKD with the entangled-based scheme by operating photon-addition operation on the left-side of the entangled source. It is found that the photon-addition operation on the left-side presents both higher success probability and better secure key rate and transmission distance than the photon subtraction on the right-side, although they share the same maximal tolerable noise. In addition, compared to both photon subtraction and photon addition on the right-side, our scheme shows the best performance and the photon addition on the right-side is the worst.

关键词: non-Gaussian operations, continuous variable, quantum key distribution, photon-addition operation

Abstract: It is shown that the non-Gaussian operations can not only be used to prepare the nonclassical states, but also to improve the entanglement degree between Gaussian states. Thus these operations are naturally considered to enhance the performance of continuous variable quantum key distribution (CVQKD), in which the non-Gaussian operations are usually placed on the right-side of the entangled source. Here we propose another scheme for further improving the performance of CVQKD with the entangled-based scheme by operating photon-addition operation on the left-side of the entangled source. It is found that the photon-addition operation on the left-side presents both higher success probability and better secure key rate and transmission distance than the photon subtraction on the right-side, although they share the same maximal tolerable noise. In addition, compared to both photon subtraction and photon addition on the right-side, our scheme shows the best performance and the photon addition on the right-side is the worst.

Key words: non-Gaussian operations, continuous variable, quantum key distribution, photon-addition operation

中图分类号: (Quantum information)

03.67.-a

05.30.-d (Quantum statistical mechanics) 42.50.Dv (Quantum state engineering and measurements) 03.65.Wj (State reconstruction, quantum tomography)

Xiao-Ting Chen(陈小婷), Lu-Ping Zhang(张露萍), Shou-Kang Chang(常守康), Huan Zhang(张欢), and Li-Yun Hu(胡利云). Continuous-variable quantum key distribution based on photon addition operation[J]. 中国物理B, 2021, 30(6): 60304-060304.

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Continuous-variable quantum key distribution based on photon addition operation

Continuous-variable quantum key distribution based on photon addition operation

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