Coexistence of Quantum Operations
نویسنده
چکیده
Quantum operations are used to describe the observed probability distributions and conditional states of the measured system. In this paper, we address the problem of their joint measurability (coexistence). We derive two equivalent coexistence criteria. The two most common classes of operations — Lüders operations and conditional state preparators — are analyzed. It is shown that Lüders operations are coexistent only under very restrictive conditions, when the associated effects are either proportional to each other, or disjoint.
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