Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine

doi:10.1088/1674-1056/27/9/090307

中国物理B ›› 2018, Vol. 27 ›› Issue (9): 90307-090307.doi: 10.1088/1674-1056/27/9/090307

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine

Hang Zhang(张航), Yu Mao(毛宇), Duan Huang(黄端), Ying Guo(郭迎), Xiaodong Wu(吴晓东), Ling Zhang(张玲)

School of Information Science and Engineering, Central South University, Changsha 410083, China

收稿日期:2018-01-27 修回日期:2018-05-17 出版日期:2018-09-05 发布日期:2018-09-05
通讯作者: Ling Zhang E-mail:lingzhang2017@foxmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61379153 and 61572529).

Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine

Hang Zhang(张航), Yu Mao(毛宇), Duan Huang(黄端), Ying Guo(郭迎), Xiaodong Wu(吴晓东), Ling Zhang(张玲)

School of Information Science and Engineering, Central South University, Changsha 410083, China

Received:2018-01-27 Revised:2018-05-17 Online:2018-09-05 Published:2018-09-05
Contact: Ling Zhang E-mail:lingzhang2017@foxmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61379153 and 61572529).

摘要/Abstract

摘要：

We propose a method to improve the secret key rate of an eight-state continuous-variable quantum key distribution (CVQKD) by using a linear optics cloning machine (LOCM). In the proposed scheme, an LOCM is exploited to compensate for the imperfections of Bob's apparatus, so that the generated secret key rate of the eight-state protocol could be well enhanced. We investigate the security of our proposed protocol in a finite-size scenario so as to further approach the practical value of a secret key rate. Numeric simulation shows that the LOCM with reasonable tuning gain λ and transmittance τ can effectively improve the secret key rate of eight-state CVQKD in both an asymptotic limit and a finite-size regime. Furthermore, we obtain the tightest bound of the secure distance by taking the finite-size effect into account, which is more practical than that obtained in the asymptotic limit.

关键词: continuous-variable quantum key distribution, linear optics cloning machine, finite-size

Abstract:

Key words: continuous-variable quantum key distribution, linear optics cloning machine, finite-size

中图分类号: (Quantum communication)

03.67.Hk

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

张航, 毛宇, 黄端, 郭迎, 吴晓东, 张玲. Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine[J]. 中国物理B, 2018, 27(9): 90307-090307.

Hang Zhang(张航), Yu Mao(毛宇), Duan Huang(黄端), Ying Guo(郭迎), Xiaodong Wu(吴晓东), Ling Zhang(张玲). Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine[J]. Chin. Phys. B, 2018, 27(9): 90307-090307.

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Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine

Finite-size analysis of eight-state continuous-variable quantum key distribution with the linear optics cloning machine

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