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.
Positive operator valued measures covariant with respect to an irreducible representation
CASSINELLI, GIOVANNI;DE VITO, ERNESTO;TOIGO, ALESSANDRO
2003-01-01
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.
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