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Communications in Theoretical Physics

Realization of Perfect Teleportation with W-States in Cavity QED

Juan He, Liu Ye, Chi Ma, Qi Liu, NI Zhi-xiang

Published Mar 1, 2008• 4 citations
Publisher

Abstract

We put forward an experimentally feasible protocol for realizing a perfect teleportation by using a class of W-state in QED. The simple way of generating the entangled channel and distinguishing the measurement bases is the distinct feature of our scheme. In addition, the probability of teleportation is up to 100%. The scheme can be implemented by the present cavity QED techniques.

DOI
10.1088/0253-6102/49/3/19

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We put forward an experimentally feasible protocol for realizing a perfect teleportation by using a class of W-state in QED. The simple way of generating the entangled channel and distinguishing the measurement bases is the distinct feature of our scheme. In addition, the probability of teleportation is up to 100%. The scheme can be implemented by the present cavity QED techniques.
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 introducing 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.
Because the property of a class of W state can be used as entanglement channel for realizing perfect teleportation and dense coding with the successful probability 100%,a simple scheme is presented for generating this W-class entangled state.It relies on the superconducting quantum interference devices(SQUIDs) simultaneously interacting with single-mode cavity field under resonant circumstances.The distinct feature lies in that the whole course of preparation only needs one step.The scheme can be implemented by the present cavity QED techniques.
Recently, Peng et al . [ 2010 Eur. Phys. J . D 58 403 ] proposed to teleport an arbitrary two-qubit state with a family of four-qubit entangled states, which simultaneously include the tensor product of two Bell states, linear cluster state and Dicke-class state. This paper proposes to implement their scheme in cavity quantum electrodynamics and then presents a new family of four-qubit entangled state |Ω 4 〉1234. It simultaneously includes all the well-known four-qubit entangled states which can be used to teleport an arbitrary two-qubit state. The distinct advantage of the scheme is that it only needs a single setup to prepare the whole family of four-qubit entangled states, which will be very convenient for experimental realization. After discussing the experimental condition in detail, we show the scheme may be feasible based on present technology in cavity quantum electrodynamics.