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Physical Review A

Disentanglement-free state of two pairs of two-level atoms

Chui‐Ping Yang, Guang‐Can Guo

Published Jun 1, 1999• 27 citations
Publisher

Abstract

In this paper, a system composed of two pairs of two-level atoms and a multimode-vacuum field is considered. In our model, either pair contains two atoms that are assumed to be set close. We propose a disentanglement-free state of the two pairs of two-level atoms. It is remarkable that when the two pairs, initially in such a state, fly apart an arbitrary distance, the state will undergo no decoherence. By means of such a state, we can prepare the perfect Einstein-Podolsky-Rosen pair shared by two ``distant'' parties and realize long-distance entanglement swapping. Finally, a method for preparing such a disentanglement-free state is presented.

DOI
10.1103/physreva.59.4217

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In this paper, a system composed of two pairs of two-level atoms and a multimode-vacuum field is considered. In our model, either pair contains two atoms that are assumed to be set close. We propose a disentanglement-free state of the two pairs of two-level atoms. It is remarkable that when the two pairs, initially in such a state, fly apart an arbitrary distance, the state will undergo no decoherence. By means of such a state, we can prepare the perfect Einstein-Podolsky-Rosen pair shared by two ``distant'' parties and realize long-distance entanglement swapping. Finally, a method for preparing such a disentanglement-free state is presented.
We present a scheme for generating four pairs of two-atom Einstein–Podolsky–Rosen (EPR) states using the simultaneous interaction of the two atoms with a single-mode cavity field under a large detuning condition. The influence of cavity dissipation on the prepared EPR states is investigated by means of the superoperator method and the state fidelity. It is shown that some kinds of the prepared EPR states are robust against cavity dissipation and the intensity of the field, and maintain their entanglement invariance, and the others are fragile and completely destroyed by the action of cavity dissipation and the intensity of the field in the long-time limit. Decoherence time of the fragile entangled states is extremely small for a typical cavity-QED experimental data.