Related papers: Strong enhancement of the persistent current by an…

This paper has been withdrawn by the authors due to a crucial error.

This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

This paper has been withdrawn by the author, due to an important sign error in Eqn. 2.

This paper has been withdrawn by the author, due to a crucial error in the proof of Lemma 3.1.

This paper has been withdrawn by the author(s), due a crucial error on the entanglement of $\Gamma$ registers.

The paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author due to a crucial sign error in Proposition 3.1.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn due to a crucial theoretical error.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author and replaced by arXiv:0809.4751

The paper has been withdrawn.

The paper has been withdrawn by the authors

This paper has been withdrawn due to a sign error in the equation for F_11 which invalidates many results.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn by the author due to a crucial sign error.

This paper has been withdrawn by the authors, due a crucial mistake in Lemma 2

The paper has been withdrawn due to numerical error.

This paper has being withdrawn by the authors due to an error in the conclusion.