相关论文: An unlikely result

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper has been withdrawn by the authors, due a oversimplified decoherence model.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This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

This paper has been withdrawn by the author due to the incorrect argument for the security.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

The paper was removed.

This paper has been withdrawn by the author

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to its publication

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors as they feel it inappropriate to publish this paper for the time being.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors because the results obtained have been reported earlier by other authors.

This paper has been withdrawn

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the author due to an error in the proof.

This paper has been withdrawn by the author due to the presented idea is wrong.