在QED腔中实现一个未知的三粒子W态的隐形传输方案

Scheme for teleportation of an unknown tripartite W state in cavity QED

量子隐形传输在量子信息科学中有着重要的地位,很多方案被设计出来用于实现隐形传输,但在实际中,存在着很多困难,例如EPR对的制备,联合Bell测量,腔衰减和热场的影响等.在本文中,首先介绍了一个单模腔,原子4、5,原子6、7和原子8、9的最大纠缠态被制备出来,从它的有效哈密顿量的形式,可以看出,热场和腔衰减可以消除掉,其次我们设计了一个未知的三粒子W态的隐形传输方案,从中可以发现,这个过程中不需要联合Bell测量,而且实现这个过程成功的概率是1.

Quantum teleportation plays a crucial role in quantum information science to date, lots of schemes have been proposed for teleportation. However, in practice, there are many difficulties, such as： the preparation of EPR pairs, the joint Bell measurement, the effects of thermal field and cavity decay. In this paper, we introduce a single - mode cavity, where the maximally entangled states of atoms 4,5, atoms 6,7, and atoms 8,9 could be prepared, from the form of the effective Hamiltonian. The effects of thermal field and cavity decay are all eliminated. Futhermore, we propose a scheme for teleportation of an unknown tripartite W state in cavity QED. We find that the joint Bell measure is not necessary, and the total success probability can reach 1 in the teleportation process.