Physics – Mathematical Physics
Scientific paper
2011-11-03
Physics
Mathematical Physics
15 pages, Some typos fixed, Theorem 2 supplemented by two originally missing cases, two references added
Scientific paper
We give a criterion of classicality for mixed states in terms of expectation
values of a quantum observable. Using group representation theory we identify
all cases when the criterion can be computed exactly in terms of the spectrum
of a single operator.
Kus Marek
Oszmaniec Michał
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