腔QED中三粒子W态的隐形传递(英文)

Teleportation of a three-atom entangled W state in cavity QED

首先,针对传递三粒子W态的困难,提出了腔QED中的两种方案来完成W态的隐形传态.在一种方案中,我们利用一个EPR对和GHZ态来作为量子通道,在真空腔中实现了对W态的传送.而第二种方案与第一种不同之处是,我们使用了两个EPR对来作为量子通道,并且引入了一个附加粒子来完成传态的.此外,这些方案的显著优点是不用Bell基测量,而且可忽略腔场热作用和腔延迟作用的影响.

We have investigated the problem of teleporting a three-atom entangled W state and propose two schemes based on entanglement swapping to complete the teleportation. We put forward the first scheme for the teleportation of W state by using an EPR pair and a GHZ state via vacuum cavities, the second scheme for teleporting W state by using two EPR pairs as quantum channels and in- troducing an addition atom via thermal cavities. Further more, the distinct advantage of the present schemes are that the Bell-state measurement is not required. The effects of cavity decay and thermal field are all eliminated.