论文部分内容阅读
基于多级编码/多级译码(MLC/MSD)系统实现了连续变量量子密钥分发的逆向数据协调。讨论了高斯连续变量量化过程中使互信息量最大时最佳量化区间的选取,并且通过理论计算给出了信噪比为4dB的情况下各级等价信道的最佳码率。协调方案中选择低密度奇偶校验码(LDPC)作为信道编码,结合边信息译码原理最终通过LDPC迭代译码算法实现了数据的逆向协调。
Reverse data coordination of continuous variable quantum key distribution based on MLC / MSD system is realized. The selection of the optimal quantization interval for maximizing the amount of mutual information in the process of Gaussian continuous variable quantization is discussed, and the optimal bit rate of equivalent channels at all levels with the SNR of 4dB is given theoretically. Low density parity check code (LDPC) is selected as the channel coding in the coordination scheme. In the end, LDPC iterative decoding algorithm is used to achieve data reverse coordination based on the principle of edge information decoding.