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This paper has been withdrawn pending revision.

This paper is withdrawn.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

This paper has been withdrawn by the author, due to a crucial error in the proof of Lemma 3.1.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

This paper has been withdrawn by the author(s), due to some technical problem.

This paper is being withdrawn by the author due a serious flaw.

This paper is withdrawn

This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.

This paper has been withdrawn by the authour.

This paper has been withdrawn by the author due to an error in the data-analysis.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

This paper has been withdrawn by the author, due a crucial error in Eq. 6.

This paper has been withdrawn by the author.

This paper has been withdrawn due to a critical error near equation (71). This error causes the entire argument of the paper to collapse. Emmanuel Candes of Stanford discovered the error, and has suggested a correct analysis, which will be…

This paper has been withdrawn by the author.

This paper has been withdrawn due to an error in figure 5.

This paper has been withdrawn by the author

This paper has been withdrawn by the author(s).The scheme presented is insecure.

This paper has been withdrawn, and will be superseded by another submission.