Related papers: Optimality of the Heisenberg limit for continuous-…

This paper has been withdrawn by the author due to a mistake in the proof of the main theorem.

This paper has been withdrawn by the author(s), due a crucial sign error in Eqn. 1.

This paper has been withdrawn due to fundamental errors.

This paper has been withdrawn by the author, due to an error in Proposition 2.2.

This paper was withdrawn by the author due to a fatal error.

This paper has been withdrawn.

This paper has been withdrawn

This paper has been withdrawn by the authors, due a oversimplified decoherence model.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

This paper has been withdrawn by the authors, because of a crucial gap in the proof of the main theorem.

This paper has been withdrawn by the author, due a crucial error in the main idea.

This paper has been withdrawn by the author due to a serious gap in the proof of the main theorem.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

We provide efficient and intuitive tools for deriving bounds on achievable precision in quantum enhanced metrology based on the geometry of quantum channels and semi-definite programming. We show that when decoherence is taken into account,…

This paper has been withdrawn by the authors, since the reference citation were not appropriately arranged.

This paper has been withdrawn by the author

This paper has been withdrawn due to a crucial theoretical and experimental error.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the authors, due a crucial mistake in Lemma 2

This paper has been withdrawn.

This paper has been withdrawn. The main technical result will reappear in the new version of quant-ph/0501003.