Given a unitary representation U of a compact group G and a transitive G-space Omega, we characterize the extremal elements of the convex set of all U-covariant positive operator valued measures.
Extremal covariant positive operator valued measures: the case of a compact symmetry group
CARMELI, CLAUDIO;TOIGO, ALESSANDRO
2008-01-01
Abstract
Given a unitary representation U of a compact group G and a transitive G-space Omega, we characterize the extremal elements of the convex set of all U-covariant positive operator valued measures.
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