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Extremal covariant quantum operations and POVM's

open access: yes, 2003
We consider the convex sets of QO's (quantum operations) and POVM's (positive operator valued measures) which are covariant under a general finite-dimensional unitary representation of a group. We derive necessary and sufficient conditions for extremality, and give general bounds for ranks of the extremal POVM's and QO's. Results are illustrated on the
openaire   +2 more sources

Constraints on Gaussian Error Channels and Measurements for Quantum Communication. [PDF]

open access: yesPhys Rev A (Coll Park), 2023
Kwiatkowski A   +6 more
europepmc   +1 more source

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