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This paper has been withdrawn.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This submission has been withdrawn by arXiv administrators because it contains fictitious content and was submitted under a pseudonym, which is against arXiv policy.

This paper has been withdrawn by the author due to a misunderstanding about 3QBF.

This paper has been withdrawn by the author due to a crucial problem associated with Figs. 2 and 3.

This paper has been withdrawn by the author, as it is now incorporated in 0901.4506 (v4)

This paper has been withdrawn.

This paper is being withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn.

This paper has been withdrawn as the result is not correct.

This paper has been withdrawn by the author due a few mistakes in the paper.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

The paper has been withdrawn by the author since the protocol is not new. It is just the oldest version of BB84.

This paper has been withdrawn by the author due to a crucial error in the submission action.

This paper has been withdrawn.

The paper has been withdrawn by the author.