三粒子纠缠W态隐形传态的正交完备基展开与算符变换

先是对利用单个两粒子及单个三粒子纠缠态作为量子信道实现三粒子纠缠W态的隐形传态方案进行讨论.然后由波函数的叠加原理与算符变换出发,将体系的总量子量按照Bell基展开实现量子隐形传态,给出了变换算符与实际操作算符之间的联系.进一步验证出变换算符可逆是成功实现三粒子纠缠W态隐形传态的必要条件的结论.

利用两个EPR对几率隐形传送三粒子W纠缠态

提出仅利用两个EPR对作为量子信道就可实现对三粒子W态的隐形传送方案，首先，引进一个辅助粒子，利用量子通道中的两个粒子，分别对辅助粒子实施CNOT操作；其次，通过构造幺正转换矩阵，可使因非最大纠缠信道导致的畸变的量子态得到恢复；最后，经过测量可概率性实现纠缠W态的隐形传送。由于使用的纠缠量子信道仅两个EPR对，不仅减少了Bell基测量的次数，而且节约了量子信道资源。

Probabilistic Teleportation of an Unknown One-Particle State by a Three-Particle General W State

Two schemes for teleporting an unknown one-particle state are proposed when a general W state is utilized as quantum channel. In the first scheme, after the sender （Alice） makes a Bell-state measurement on her particles, the recipient （Bob） performs a Von Neumann measurement and introduces an auxiliary particle, and carries out a unitary transformation on his particle and the auxiliary particle, and performs a Von Neumann measurement on the auxiliary particle to confirm whether the teleportation succeeds or not. In the second scheme, the recipient （Bob） does not need to perform the first Von Neumann measurement or introduce the auxiliary particle, which is necessary in the first scheme. It is shown that the maxima/probabilities of successful teleportation of the two schemes are identical if the recipient （Bob） performs an appropriate unitary transformation and adopts a proper particle on which he recovers the quantum information of state to be teleported.