Positive operator valued measures covariant with respect to an irreducible representation
arXiv:quant-ph/0302187 · doi:10.1063/1.1598277
Abstract
Given an irreducible representation of a group G, we show that all the covariant positive operator valued measures based on G/Z, where Z is a central subgroup, are described by trace class, trace one positive operators.
9 pages, Latex2e
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