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

• GENERAL • 上一篇    下一篇

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. 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. 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: 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)