完全区分4个Bell态是实现量子隐形传态过程的关键,目前线形光学的办法还不能对Bell态进行完全的测量。我们根据两光子量子隐形传态方案利用Mach-Zehnder干涉仪,通过高位希尔伯特空间中偏振与路径之间的纠缠实现了完全bell基测量。通过引入参考光的方法,达到干涉仪两臂相位的自动稳定;该方案成功应用于16 km自由空间量子隐形传态实验中。

To completely distinguish the four Bell States is the key of Quantum teleportation.Now by insing linear optics methods,we can not perform complete Bell measurement.Based on the method of two photon quantum teleportation which uses Mach-Zehnder interferometer,we propose a scheme which can completely make the Bell measurement in the quantum teleportation experiment in upper dimension space.Through the introduction of the reference of beam we can stabilize the interferometer′s phase automatically.The scheme is used in the 16km free space quantum teleportation experiment.