基于奇偶检错-汉明纠错算法的误码率后验分布参数,用仿真数据直接估计纠错后的误码率及其置信区间.实验中利用两个伪随机二进制序列替代原始量子密钥,长度为1.4×10-7,误码呈二项分布,通过奇偶检错后利用(7,4)汉明码对奇偶性不一致的码字进行纠错.实验结果表明:当初始误码率为3％时,通过一次检错、纠错,误码率降至2.47×10-3,置信度为95％的上限值为2.77×10-3;当初始误码率为0.1％时,通过一次纠错,误码率降至1.43×10-7,置信度为95％的上限值为10.54×10-7.该方法有效地估计了奇偶-汉明纠错码对有限长度原始量子密钥纠错后的误码率,为量子密钥分配后续处理提供了可靠的数据支持.
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