Coexistence of qubit effects



: Stano P, Reitzner D, Heinosaari T

Publisher: AMER PHYSICAL SOC

: 2008

 Physical Review A

: PHYSICAL REVIEW A

: PHYS REV A

: ARTN 012315

: 78

: 1

: 9

: 1050-2947

DOI: https://doi.org/10.1103/PhysRevA.78.012315


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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