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This paper has been withdrawn by the authors due to an unlikely results.

This paper has been withdrawn by the author(s), due a crucial error in Eqn. 30.

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This paper has been withdrawn by the authors, due a crucial error in Sec. 3.

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This paper has been withdrawn by the authors and replaced by the revised version in arXiv:0709.1772.

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This paper has been withdrawn by the author due to essential mistakes in some previous versions.

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This paper has been withdrawn by the author and replaced by arXiv:0809.4751

This paper has been withdrawn since it was an inadvertant double submission. An updated version of the original submission can be found at quant-ph/0505131

This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.