量子密钥分发所面临的最主要问题足如何实现高码率、远距离的量子密钥传输.为提高量子保密通信系统量子密钥生成的速率,将双探测器量子密钥分发方案应用于BBM92协议,并分别在理想纠缠光源、参量下转换纠缠光源两种情况下进行了数值仿真.对系统性能进行对比后得出:在BBM92协议中利用双探测器,量子密钥分发系统的密钥生成率明显高于单探测器系统,而误码率大幅度低于单探测器系统.理想光源情况下传输距离可扩展到300 km,参量下转换光源的情况下,传输距离也可达250 km.
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