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Physical Review A

Teleportation of atomic states within cavities in thermal states

Shi‐Biao Zheng, Guang‐Can Guo

Published Mar 15, 2001• 101 citations
Publisher

Abstract

A scheme is proposed for the teleportation of atomic states within cavities. The scheme is insensitive to the cavity field states and cavity decay. The teleportation may be achieved in a simple way. We show how the idea can be used to generate multiatom entangled states. In order to entangle n atoms, we require $n\ensuremath{-}1$ cavities and allow the first cavity to exchange energy with the environment. The other $n\ensuremath{-}2$ cavities are always in the vacuum state and thus the cavity decay is suppressed.

DOI
10.1103/physreva.63.044302

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•Apr 10, 2009•0 citations
A scheme is proposed for the teleportation of atomic states within cavities. The scheme is insensitive to the cavity field states and cavity decay. The teleportation may be achieved in a simple way. We show how the idea can be used to generate multiatom entangled states. In order to entangle n atoms, we require n\ensuremath−1n\ensuremath{-}1n\ensuremath−1 cavities and allow the first cavity to exchange energy with the environment. The other n\ensuremath−2n\ensuremath{-}2n\ensuremath−2 cavities are always in the vacuum state and thus the cavity decay is suppressed.
An experimentally feasible scheme is proposed for the teleportation of an atomic state and of a two-atom entangled state within the microwave cavity quantum electrodynamics with unit probability of success. Our scheme is based on the interaction between atoms and a single-mode nonresonant cavity with the assistance of a strong classical driving field. Thus the teleportation scheme is insensitive to the thermal state. This idea can also be used to teleport an arbitrary two-atom pure state via two pairs of atomic Einstein-Podolsky-Rosen states in a straightforward way.
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.