Spherical reconciliation for a continuous-variable quantum key distribution

doi:10.1088/1674-1056/26/4/040304

中国物理B ›› 2017, Vol. 26 ›› Issue (4): 40304-040304.doi: 10.1088/1674-1056/26/4/040304

Spherical reconciliation for a continuous-variable quantum key distribution

Zhao Lu(卢钊), Jian-Hong Shi(史建红), Feng-Guang Li(李风光)

1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
2 Science and Technology on Information Assurance Laboratory, Beijing 100072, China

收稿日期:2016-08-06 修回日期:2016-11-10 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: Jian-Hong Shi E-mail:shijianhong2011@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1304613 and 11204379).

Spherical reconciliation for a continuous-variable quantum key distribution

Zhao Lu(卢钊)¹, Jian-Hong Shi(史建红)^1,2, Feng-Guang Li(李风光)¹

1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
2 Science and Technology on Information Assurance Laboratory, Beijing 100072, China

Received:2016-08-06 Revised:2016-11-10 Online:2017-04-05 Published:2017-04-05
Contact: Jian-Hong Shi E-mail:shijianhong2011@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1304613 and 11204379).

摘要/Abstract

摘要： Information reconciliation is a significant step for a continuous-variable quantum key distribution (CV-QKD) system. We propose a reconciliation method that allows two authorized parties to extract a consistent and secure binary key in a CV-QKD protocol, which is based on Gaussian-modulated coherent states and homodyne detection. This method named spherical reconciliation is based on spherical quantization and non-binary low-density parity-check (LDPC) codes. With the suitable signal-to-noise ratio (SNR) and code rate of non-binary LDPC codes, spherical reconciliation algorithm has a high efficiency and can extend the transmission distance of CV-QKD.

关键词: continuous-variable quantum key distribution, quantization, spherical reconciliation

Abstract: Information reconciliation is a significant step for a continuous-variable quantum key distribution (CV-QKD) system. We propose a reconciliation method that allows two authorized parties to extract a consistent and secure binary key in a CV-QKD protocol, which is based on Gaussian-modulated coherent states and homodyne detection. This method named spherical reconciliation is based on spherical quantization and non-binary low-density parity-check (LDPC) codes. With the suitable signal-to-noise ratio (SNR) and code rate of non-binary LDPC codes, spherical reconciliation algorithm has a high efficiency and can extend the transmission distance of CV-QKD.

Key words: continuous-variable quantum key distribution, quantization, spherical reconciliation

中图分类号: (Quantum cryptography and communication security)

03.67.Dd

03.67.Hk (Quantum communication) 84.40.Ua (Telecommunications: signal transmission and processing; communication satellites)

卢钊, 史建红, 李风光. Spherical reconciliation for a continuous-variable quantum key distribution[J]. 中国物理B, 2017, 26(4): 40304-040304.

Zhao Lu(卢钊), Jian-Hong Shi(史建红), Feng-Guang Li(李风光). Spherical reconciliation for a continuous-variable quantum key distribution[J]. Chin. Phys. B, 2017, 26(4): 40304-040304.

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Spherical reconciliation for a continuous-variable quantum key distribution

Spherical reconciliation for a continuous-variable quantum key distribution

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