基于单光子源技术的光通信密钥分配

Key distribution of optical communication based on single photon source technology

为了解决当前密钥分配方法躲避探测器攻击性差、安全传输距离不理想等问题,提出基于单光子源技术的光通信密钥分配方法。通过分析单光子源双模态特性,架构Alice与Bob探测器光子信道结构;根据计数率与误码率,得到单光子源量子比特误码率;基于Alice门限探测器的分析和数据调度策略,对初始密钥进行校正处理,并获取密钥生成速率;采用二进制香农熵函数,完成实际光通信密钥分配时密钥产生速率估算;依据安全密钥概率不等式,分别对增益与误码率进行改写,利用其上下限估算公式,求解相应数值,经过第三方参数指标实现探测器距离优化,最终完成密钥分配任务。实验结果表明:方法具有较好的传输损耗承载力,密钥分配准确率最高可达96%,且安全传输距离最远可达500 km,具有一定实际意义。

In order to solve the bad performance of detector attack and poor safety transmission distance problems of the current key allocation method,the optical communication key allocation method based on single-photon source technology is proposed.The single-photon quantum bit error rate is obtained based on counting rate and bit error rate,the initial key is corrected and the key generation rate is obtained based on Alice threshold detector analysis and data scheduling strategy,and the key generation rate is obtained.According to rate inequality,the gain and BER are rewritten,respectively.Using its upper and lower limit estimation formula to solve the corresponding value,through third party parameter index to achieve detector distance optimization,and finally complete the key allocation task.The experimental results show that this method has better transmission loss capacity,the highest accuracy of key distribution is 96%,and the safest transmission distance is up to 500 km,which has certain practical significance.