Disentanglement-free state of two pairs of two-level atoms
- 1 June 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 59 (6), 4217-4222
- https://doi.org/10.1103/physreva.59.4217
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.Keywords
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