Entropic uncertainties for joint quantum measurements

Brougham, T., Andersson, E. and Barnett, S.M. (2009) Entropic uncertainties for joint quantum measurements. Physical Review A: Atomic, Molecular and Optical Physics, 80(4), 042106. (doi: 10.1103/PhysRevA.80.042106)

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We investigate the uncertainty associated with a joint quantum measurement of two spin components of a spin-12 particle and quantify this in terms of entropy. We consider two entropic quantities, the joint entropy and the sum of the marginal entropies, and obtain lower bounds for each of these quantities. For the case of joint measurements where we measure each spin observable equally well, these lower bounds are tight.

Item Type:Articles
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 (Online):1094-1622

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