Coexistence of qubit effects
classification
🪐 quant-ph
keywords
effectsqubitcharacterizationpairsallowedcasescharacterizecheck
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We characterize all coexistent pairs of qubit effects. This gives an exhaustive description of all pairs of events allowed, in principle, to occur in a single qubit measurement. The characterization consists of three disjoint conditions which are easy to check for a given pair of effects. Known special cases are shown to follow from our general characterization theorem.
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