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