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采用低密度奇偶校验码(LDPC)实现了逆向协调的连续变量量子密钥分发的仿真研究.采用多级编码/多级译码结构的协调校验方案,充分利用矢量量化、迭代译码等优化技术,并结合最逼近仙农极限的信道编码,实现了高效率的逆向协调算法.通过仿真计算,最终能够实现20km单模光纤中2.2kb/s的密钥传输速率,编码效率达到0.89,并且仍有很大的提高余地.
The low-density parity-check code (LDPC) is used to simulate reverse-coordinated quantum key distribution of continuous variables.Using the multi-level coding / multi-level coding scheme, this paper makes full use of vector quantization and iterative decoding Optimization technology and combined with the channel coding closest to the limit of agriculture to achieve a highly efficient reverse coordination algorithm.Finally, the key transmission rate of 2.2kb / s in 20km single-mode fiber can be achieved by simulation calculation, the coding efficiency reaches 0.89, And there is still a lot of room for improvement.