提出了一种利用四粒子Ω 纠缠态作为量子信道,实现单量子比特、双量子比特以及受限三量子比特的双向隐形传态方案。 当纠缠的粒子个数大于3时,会呈现出与一般两粒子纠缠时不同的特殊性质。这种由多个粒子纠缠在 一起的纠缠态,被称为团簇态。选用四粒子Ω 纠缠态作为量子信道。距离很远的通信双方事先共享制备好的两对四粒子Ω 纠缠态。通信开始时,通信双方把各自待传的粒子放到量子信道上,形成系统的初态。通信开始后, 只要通信双方选择合适的正交完备基分别对自己拥有的部分粒子做量子投影测量,把测量结果通过经 典信道传送给对方,双方根据对方的测量结果,选择相应的幺正变换可以得到对方待传的未知的量子态。

A scheme of two-way quantum teleportation was proposed via Ω quadripartite entangled state as quantum channel to teleport unknown general one or two qubit and restricted three qubit state. First of all, two sides of communication, which are far away from each other, share two pairs Ω of quadripartite entangled state in advance. The entangled state will present some special characteristics, which are different from the general two particles when the number of the particles is more then 3. This multi-particle entangled state is called as cluster state which shows higher correlation and concurrence. Just in time, as one of the cluster state, quadripartite entangled state Ω is very suitable as quantum channel. When communicating, two sides perform the quantum projection measuresment with the appropriate orthogonal basis vectors, separately. Then they send the measurement results to each other by the classical channel. The two sides can choose appropriate unitary operation on his own qubits according to the obtained measurement results to obtain the unknown state, respectively.