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There are some problems with this paper, and it is being withdrawn.

This paper has been withdrawn by the author because the result of this paper was already obtained.

This paper has been withdrawn by the author(s), due a crucial error on the entanglement of $\Gamma$ registers.

This paper has been withdrawn because the new one gr-qc/0512095 includes all its results (as well as those in gr-qc/0507018), in a clearer way.

This paper is being withdrawn.

This paper has been withdrawn by the authors due to its publication

This paper has been withdrawn by the author due to text overlap with arXiv:1102.5004, as well as omission of proper citations to arXiv:1110.4655 and arXiv:1111.0313

This paper has been withdrawn by the author due to imprecisions which must conduce to wrong results.

Paper withdrawn due to error.

This paper has been withdrawn due to conflicts with journal copyright issues.

The paper is being withdrawn since the results are incorporated in paper arxiv.org/abs/math.AG/0306195.

This paper has been withdrawn by the author(s). Please refer to quant-ph/0311171.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper has been withdrawn by the author because there are some typos in proofs.

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been temporarily withdrawn, due to an error in Eq. (3).

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author, due a crucial error in Eq. 6.