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Journal of Yanbian University

Teleportation of a Three-atom Entangled W State Using Three EPR Pairs in Cavity QED

Xin Ji

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

We proposed a scheme for teleporting a three-atom entangled W state in cavity QED.In the scheme,three EPR pairs are chosen as quantum channel shared by the sender and the receiver.By using atom-cavity-field interaction and appropriate unitary transformations,the three-atom entangled W state can be teleported successfully with probability 1.0.Moreover,the scheme does not need joint Bell measurement and is insensitive to the cavity decay and thermal field.

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Chinese Journal of Quantum Electronics•Jan 1, 2006•0 citations
We proposed a scheme for teleporting a three-atom entangled W state in cavity QED.In the scheme,three EPR pairs are chosen as quantum channel shared by the sender and the receiver.By using atom-cavity-field interaction and appropriate unitary transformations,the three-atom entangled W state can be teleported successfully with probability 1.0.Moreover,the scheme does not need joint Bell measurement and is insensitive to the cavity decay and thermal field.
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.
A scheme for teleportation of an unknown three-atom entangled W state is proposed,in which a cluster state of four identical two-level atoms is used as quantum channel.It is proved that,an arbitrary three-atom entangled W state can be teleported perfectly by introducing an additional atom and performing a collective unitary transformation as well as appropriate single-atom unitary transformations on the receiver's side based on the classical information of the sender.In the scheme,the effects of the thermal field and the cavity decay are eliminated.Furthermore,the Bell measurements are not needed,and the successful probability of teleportation is 1.
We propose a scheme for teleportation of an unknown three-atom W state without the Bell-state measurement. Firstly, we prepare an unknown three-atom W state by the resonant interaction between the atoms and the cavity. Then a quantum channel is prepared by sending two atoms through a single-mode cavity field, and driving them by a strong classical field at the same time. During the interaction between the atoms and the cavity, the states of these atoms are evolved. After the interaction, we prepare the EPR states, which form the quantum channel. Finally, we implement the teleportation of the unknown three-atom W state using the way of preparing the quantum channel. During the teleportation, the effects of thermal field and cavity decay are all eliminated. The success probability is 1.0.