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This paper has been withdrawn by the author(s).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

This paper has been withdrawn by the authors. This is due to the fact that it has been substantially revised. As a consequence title and aim of the contents

This paper is being withdrawn by the authors in order to correct some errors and also to introduce improved theoretical techniques.

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

This paper has been withdrawn.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn for the reasons mentioned in the Comments.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author since the comments have been withdrawn.

This paper is withdrawn.

This paper has been withdrawn by the author due to an error in the derivation.

This paper has been withdrawn by the author because it has been substantially modified.

The paper is being withdrawn because of some theoretical inconsistencies.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial sign error in equation 1