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Teleportation of a three-atom Entangled W State in Cavity QED

Rui Zou, Fang Jian-Xing

Published Apr 10, 2009• 0 citations
OpenAlex

Abstract

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.

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International Journal of Modern Physics B•May 20, 2008•0 citations
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.
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.
We present two schemes for probabilistically teleporting a two-atom entangled state using a three-atom partially entangled state as the quantum channel in cavity QED with the help of separate atomic measurements. The first scheme is only based on the interaction between two driven atoms and a quantized cavity mode in the large detuning limit, so the effects of both cavity decay and the thermal field are eliminated. In the second scheme, it is necessary to introduce an additional resonant cavity besides the thermal cavity to realize the teleportation, and the corresponding success probability is improved.