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This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors due to some technical problems in the paper.

The paper has been withdrawn

This paper is withdrawn. See quant-ph/9806031 for a discussion.

This paper was withdrawn by the author because severe errors were discovered.

This paper has been withdrawn.

This paper has been withdrawn by the authors.

This paper has been withdrawn. See quant-ph/9806031 for a discussion.

This paper has been withdrawn by the author.

This paper is withdrawn by the authors.

This paper has been withdrawn by the author and replaced by arXiv:0809.4751

This paper has been withdrawn.

The article is taken out.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

The paper was retracted.

The paper has been withdrawn because the research work is still in progress.

This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

This paper has been withdrawn by the author

The paper has been withdrawn.