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This paper has been withdrawn by the author.

This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the publication.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

The paper is withdrawn by the author, due to the fact that in Larsson's Phys.Lett. A256 (1999) 245-252 (quant-ph/9901074) a similar model was published with even higher efficiency.

The paper has been withdrawn by the author.

This paper has been withdrawn due to an error found by Dana Angluin and Lev Reyzin.

This paper has been withdrawn

This paper has been retracted.

This paper has been withdrawn by the author.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the authors due to new experimental results.

This paper has been withdrawn by Wenji Deng (e-mail: [email protected]) for further modification at Oct. 12, 1998. {PACS: 03.75.Fi, 05.30.Jp.64.60.-i, 32.80.Pj}

This paper has been withdrawn, not because of any errors (that we know of), but because rather than presenting our material as a series of 3 papers, as we originally intended, we have now combined them into one long paper, which is "A…

This paper has been withdrawn by the author, due to a crucial error in page 5.

This paper was withdrawn by the authors.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author due to a crucial error in the definition of homomorphism.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2073.

This paper has been withdrawn by the author, due to errors in the figures.

This paper has been withdrawn by the authors, due the copyright policy of the journal it has been submited to.