Cloning and joint measurements of incompatible components of spin

Brougham, T., Andersson, E. and Barnett, S.M. (2006) Cloning and joint measurements of incompatible components of spin. Physical Review A: Atomic, Molecular and Optical Physics, 73(6), 062319. (doi:10.1103/PhysRevA.73.062319)

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Abstract

A joint measurement of two observables is a simultaneous measurement of both quantities upon the same quantum system. When two quantum-mechanical observables do not commute, then a joint measurement of these observables cannot be accomplished directly by projective measurements alone. In this paper we shall discuss the use of quantum cloning to perform a joint measurement of two components of spin associated with a qubit system. We introduce cloning schemes which are optimal with respect to this task. The cloning schemes may be thought to work by cloning two components of spin onto their outputs. We compare the proposed cloning machines to existing cloners.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barnett, Professor Stephen and Brougham, Dr Thomas
Authors: Brougham, T., Andersson, E., and Barnett, S.M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review A: Atomic, Molecular and Optical Physics
Publisher:American Physical Society
ISSN:1050-2947
ISSN (Online):1094-1622

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