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  • Received: Apr. 8, 2019

    Accepted: Jun. 26, 2019

    Posted: Sep. 16, 2019

    Published Online: Sep. 16, 2019

    The Author Email: Duan Huang (duanhuang@csu.edu.cn)

    DOI: 10.3788/COL201917.112701

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    Ying Guo, Kangshuai Wang, Duan Huang, Xueqin Jiang. High efficiency continuous-variable quantum key distribution based on QC-LDPC codes[J]. Chinese Optics Letters, 2019, 17(11): 112701

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Chinese Optics Letters, Vol. 17, Issue 11, 112701 (2019)

High efficiency continuous-variable quantum key distribution based on QC-LDPC codes

Ying Guo1, Kangshuai Wang1, Duan Huang1,*, and Xueqin Jiang2

Author Affiliations

  • 1School of Computer Science and Engineering, Central South University, Changsha 410083, China
  • 2School of Information Science and Technology, Donghua University, Shanghai 201620, China

Abstract

Seeking good error correcting codes to improve the efficiency of continuous-variable quantum key distribution (CVQKD) reconciliation is a concerning issue. Due to the introduction of multidimensional reconciliation, the error correcting techniques in the classical binary-input additive white Gaussian noise channel are applicable to CVQKD. In this Letter, we apply the quasi-cyclic low-density parity-check (QC-LDPC) codes, which are specified in 5G protocol, to the reconciliation process. Simulation results show that the reconciliation efficiency can reach 92.6% when the code rate is 22/68 and the signal-to-noise ratio is 0.623. Such a new error correcting code points out a new direction for the development of CVQKD.