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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

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This paper has been withdrawn, as it has been merged into arXiv:1009.6144

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

The paper was withdrawn by the author. Further research is needed.

This paper was withdrawn by the author.

This paper has been withdrawn by the authors,because the proposed protocol is still coverd by the no-go theorem of Mayers, Lo and Chau. We thank H-K. Lo and HF Chau for helpful correspondences.

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This paper has been withdrawn due to non-clearness of some technical points, as well as lack of a reasonable statement of quantization conjecture.