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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 17,
  • Issue 11,
  • pp. 112701-
  • (2019)

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

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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.

© 2019 Chinese Laser Press

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