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This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

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This paper has been withdrawn by the author due to extremely unscientific errors.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

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This paper has been withdrawn. The main technical result will reappear in the new version of quant-ph/0501003.

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