Related papers: Space-bounded computation: quantum is better than …

This paper has been withdrawn by the authors.

This paper has been withdrawn, since it contains a corollary with impossible consequences and the source of an error is currently unknown.

The paper has bene withdrawn by the author.

This paper has been withdrawn while the author verifies the literature.

This paper has been withdrawn by the author due to the paper does not belong to Condensed Matter field.

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

This paper has been withdrawn by the author for further investigation.

This paper has been withdrawn due to crucial erros in equations (24)--(31).

This paper has been withdrawn.

Paper withdrawn. Replaced by by gr-qc/0212077 .

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn

The paper has been withdrawn by the autors. The proposed code is not working because orthogonality.

This paper has been withdrawn.

This paper has been withdrawn by the author because there are some typos in proofs.

This paper has been withdrawn by the author(s), due a crucial error on the entanglement of $\Gamma$ registers.

This paper has been withdrawn by Christino Tamon and Tomoyuki Yamakami because of errors of the main theorems. An erratum appeared in the Proceedings of the UMC 2000 Conference published by Springer.

This paper has been withdrawn by the authors, due to a flaw in the proof of Theorem 1. This preprint is superseded by quant-ph/0610027, where a correct proof can be found. Thanks to Rainer Siegmund-Schultze for spotting the error.

This paper has been withdrawn by the author, due to a crucial error in the proof of Lemma 3.1.

This paper has been withdrawn by the author, as it is now incorporated in 0901.4506 (v4)