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Chin. Phys. B, 2017, Vol. 26(4): 040304    DOI: 10.1088/1674-1056/26/4/040304
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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
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.
Keywords:  continuous-variable quantum key distribution      quantization      spherical reconciliation  
Received:  06 August 2016      Revised:  10 November 2016      Published:  05 April 2017
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
  84.40.Ua (Telecommunications: signal transmission and processing; communication satellites)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1304613 and 11204379).
Corresponding Authors:  Jian-Hong Shi     E-mail:  shijianhong2011@163.com

Cite this article: 

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 2017 Chin. Phys. B 26 040304

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