Information measures and classicality in quantum mechanics

Details Information measures and classicality in quantum mechanics Information measures and classicality in quantum mechanics

1998-05-19

arxiv.org/abs/quant-ph/9805055v1

Phys.Rev. D59 (1999) 045001

Physics

Quantum Physics

35 pages, LATEX

Scientific paper

10.1103/PhysRevD.59.045001

We study information measures in quantu mechanics, with particular emphasis on providing a quantification of the notions of classicality and predictability. Our primary tool is the Shannon - Wehrl entropy I. We give a precise criterion for phase space classicality and argue that in view of this a) I provides a measure of the degree of deviation from classicality for closed system b) I - S (S the von Neumann entropy) plays the same role in open systems We examine particular examples in non-relativistic quantum mechanics. Finally, (this being one of our main motivations) we comment on field classicalisation on early universe cosmology.

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