Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

Quantum state separation, unambiguous discrimination and exact cloning

Chefles, A. and Barnett, S.M. (1998) Quantum state separation, unambiguous discrimination and exact cloning. Journal of Physics A: Mathematical and Theoretical, 31 (50). pp. 10097-10103. ISSN 0305-4470

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Unambiguous discrimination and exact cloning reduce the square-overlap between quantum states, exemplifying the more general type of procedure we term state separation. We obtain the maximum probability with which two equiprobable quantum states can be separated by an arbitrary degree, and find that the established bounds on the success probabilities for discrimination and cloning are special cases of this general bound. The latter also gives the maximum probability of successfully producing N exact copies of a quantum system whose state is chosen secretly from a known pair, given M initial realizations of the state, where N > M. We also discuss the relationship between this bound and that on unambiguous state discrimination.