Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

doi:10.1088/1674-1056/27/5/050301

中国物理B ›› 2018, Vol. 27 ›› Issue (5): 50301-050301.doi: 10.1088/1674-1056/27/5/050301

Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

Yingming Zhou(周颖明), Xue-Qin Jiang(蒋学芹), Weiqi Liu(刘维琪), Tao Wang(王涛), Peng Huang(黄鹏), Guihua Zeng(曾贵华)

1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory on Navigation and Location-based Service, and Center of Quantum Information Sensing and Processing(QSIP), Shanghai Jiao Tong University, Shanghai 200240, China;
2 College of Information Science and Technology, Northwest University, Xi'an 710127, China;
3 School of Information Science and Technology, Donghua University, Shanghai 201620, China

收稿日期:2018-01-15 修回日期:2018-02-10 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: Peng Huang, Guihua Zeng E-mail:huang.peng@sjtu.edu.cn;ghzeng@sjtu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.61332019,61671287,and 61631014) and the National Key Research and Development Program of China (Grant No.2016YFA0302600).

Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

Yingming Zhou(周颖明)¹, Xue-Qin Jiang(蒋学芹)³, Weiqi Liu(刘维琪)², Tao Wang(王涛)¹, Peng Huang(黄鹏)¹, Guihua Zeng(曾贵华)^1,3

1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory on Navigation and Location-based Service, and Center of Quantum Information Sensing and Processing(QSIP), Shanghai Jiao Tong University, Shanghai 200240, China;
2 College of Information Science and Technology, Northwest University, Xi'an 710127, China;
3 School of Information Science and Technology, Donghua University, Shanghai 201620, China

Received:2018-01-15 Revised:2018-02-10 Online:2018-05-05 Published:2018-05-05
Contact: Peng Huang, Guihua Zeng E-mail:huang.peng@sjtu.edu.cn;ghzeng@sjtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.61332019,61671287,and 61631014) and the National Key Research and Development Program of China (Grant No.2016YFA0302600).

摘要/Abstract

摘要： The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio scenarios. The virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation procedure. In this paper, we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel, which may be called the finite-dimension effect. Such an effect results in an overestimation on the secret key rate, and subsequently induces vital practical security loopholes.

关键词: multi-dimensional reconciliation, finite-dimensional effect, continuous-variable, quantum key distribution

Abstract: The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio scenarios. The virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation procedure. In this paper, we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel, which may be called the finite-dimension effect. Such an effect results in an overestimation on the secret key rate, and subsequently induces vital practical security loopholes.

Key words: multi-dimensional reconciliation, finite-dimensional effect, continuous-variable, quantum key distribution

中图分类号: (Quantum communication)

03.67.Hk

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

周颖明, 蒋学芹, 刘维琪, 王涛, 黄鹏, 曾贵华. Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation[J]. 中国物理B, 2018, 27(5): 50301-050301.

Yingming Zhou(周颖明), Xue-Qin Jiang(蒋学芹), Weiqi Liu(刘维琪), Tao Wang(王涛), Peng Huang(黄鹏), Guihua Zeng(曾贵华). Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation[J]. Chin. Phys. B, 2018, 27(5): 50301-050301.

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Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

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