Spherical reconciliation for a continuous-variable quantum key distribution

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

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
Accepted manuscript online:

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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