Related papers: Generating entangled light with atomic ensembles

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This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment.

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This paper has been withdrawn because of serious errors.

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We withdraw this paper due to insufficient arguments in the derivation of Theorem 1. See quant-ph/0005062 for the new paper

This paper has been withdrawn by the author due to the unsure solution to the Dyson-Schwinger equation.

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

This paper has been withdrawn by the author, due to errors in the figures.

This paper has been removed by arXiv administrators because of excessive overlap with gr-qc/0506062.

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This paper has been withdrawn by the author due to some problems.

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This paper has been withdrawn by the author due to a crucial error in equation (51).