相位调制自由空间量子密钥分配

Phase-modulated free space quantum key distribution

通过一组正对的望远镜耦合 ,采用以不等臂Mach_Zehnder干涉仪为基础的相位编码方式 ,成功地实现了实验室内 12m距离的自由空间量子密钥分配 .实验表明这样的系统工作稳定可靠 ,与偏振编码一样 ,相位编码也可用于自由空间的量子密钥分配 .

We have realized the phase-modulated free space quantum key distribution(QKD) of a distance 12m, based on the unbalanced Mach-Zehnder interferometer. The set up is stable and secure and it is proved that the phase can be used as coding in the free space QKD just like the polarization.