Related papers: The four-qubit singlet state and decoherence-free …

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This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

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This paper has been withdrawn because the issues raised have been resolved by Cabibbo and Isidori, hep-ph/0502130.

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This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the authors due to need of essential revision.

This paper has been withdrawn by Wenji Deng (e-mail: [email protected]) for further modification at Oct. 12, 1998.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}

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