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This paper has been withdrawn by the author.

This paper has been withdrawn by the author. It will be replaced, substantially modified, by sections of the author's completed PhD thesis.

This paper has been withdrawn by the author, due to the fact that a similar paper (quant-ph/9904075) has been published.

This paper has been withdrawn at the author's request.

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This paper has been withdrawn by the author due to some problems.

This paper has been withdrawn by the authors due to need of essential revision.

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This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.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This paper has been withdrawn by the author

This paper has been withdrawn by the author(s), due a crucial error on the entanglement of $\Gamma$ registers.