Related papers: Charge State Measurement and Persistent Current in…

This paper has been temporarily withdrawn for corrections.

This paper has been withdrawn by the author, due to the crucial mistake of the discussion in Sec IV.

This paper has been withdrawn by the authors because M. Aschenbrenner pointed out that the proof of theorem 3.1 was incorrect.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

This paper has been withdrawn by the author due to an error in section 7. There is a new version: arXiv:1011.3352.

This paper has been withdrawn.

This paper has been withdrawn by the authors, due to a crucial error in beta functions.

This paper has been withdrawn by the author, due to a crucial error in the proof of Thm.1

This paper has been withdrawn by the author due to a crucial error in last part of proof.

This paper has been withdrawn by the author(s), due a crucial sign error in Eqn. 1.

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the author due to an error

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

This paper has been withdrawn due to an incorrect proof.

This paper has been withdrawn since it was an inadvertant double submission. An updated version of the original submission can be found at quant-ph/0505131

This paper was withdrawn by the author because severe errors were discovered.

This paper has been withdrawn by the author(s),

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.