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This paper has been withdrawn by the authors, due to the discovery of paper 0201028 which predates it and contains most of it's results.

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This paper has been withdrawn, because the argument for generation of Goldstone modes is incorrect.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

The paper has been withdrawn.

This paper has been withdrawn as it has been superseded by postings arXiv:quant-ph/0702147 and arXiv:0712.2935

This paper has been withdrawn by the authors due to overlap with other papers.

This paper has been withdrawn pending revision.

This paper has been withdrawn

This paper has been withdrawn by the authors due to a crucial error in the proof of the main result. In a new manuscript (with two new authors) available at arXiv:1010.2791v1 this problem has been resolved.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors

This paper has been withdrawn by the author.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author due to a crucial mistakes.

This paper has been retracted.

This paper and abstract have been withdrawn.

The paper has been withdrawn by the authors. See newer and expanded version quant-ph/0606221, published in Europhysics Letters 78, 30004 (2007).

This paper had been withdrawed