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This paper has been withdrawn by the authors as they feel it inappropriate to publish this paper for the time being.

This paper has been withdrawn by the author due to a crucial problem in Lemma 3. This equation must be changed.

This paper has been withdrawn.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author due to the need for further revision.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author due to a crucial mistakes.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn due to an incorrect proof.

The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors, due a oversimplified decoherence model.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

After receiving useful peer comments, we would like to withdraw this paper.

This paper has been withdrawn by the author, due to errors in the figures.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn