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The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

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This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the authors, due a oversimplified decoherence model.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

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors pending corrections.

This paper has been withdrawn

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to a crucial error in one of equation in (3).

This paper has been withdrawn by the author due to a crucial sign error in equation 1

Title: An unlikely result Authors: T.M. Other Comments: This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the fact that some of the results turned out to be known.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

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This paper has been withdrawn by the author because it has been substantially modified.

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

The paper has been withdrawn by authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.