论文部分内容阅读
在量子高斯密钥分发实验中,后处理是提升数据协调效率和保证安全密钥提取的关键技术之一。通过分层纠错协议给出一种具体后处理的数据协调方案,并采用准循环低密度奇偶校验码与传统低密度奇偶校验码相级联的方式对信息进行压缩编码。结合零拍探测下的连续变量量子密钥分发,分析了个体攻击和集体攻击下采用正向协调和逆向协调的实验方案中密钥提取的安全性。实验结果表明:在码长为2×10~5,三、四级码率为0.3 0.95的数据协调方案中协调效率可达91.2%。采用最优攻击下可提取安全密钥量为3.98 kbit/s,而传输距离达30 km左右,证明了所提协调方案的安全性,能够满足城域网络的通信要求。
In the quantum Gaussian key distribution experiment, post-processing is one of the key technologies to improve data coordination efficiency and ensure secure key extraction. Through a hierarchical error correction protocol, a specific post-processing data coordination scheme is given, and the information is compressed and encoded in a way that the quasi-cyclic low-density parity-check code is cascaded with the traditional low-density parity check code. Combined with the continuous variable quantum key distribution under zero-shot detection, the key extraction security in the experimental scheme adopting forward coordination and reverse coordination under individual attack and collective attack is analyzed. Experimental results show that the coordination efficiency can reach 91.2% in the data reconciliation scheme with the code length of 2 × 10 ~ 5 and the third and fourth code rates of 0.3 0.95. Under the optimal attack, the security key can be extracted to 3.98 kbit / s, while the transmission distance is about 30 km, which proves the security of the proposed coordination scheme and can meet the communication requirements of metropolitan area network.