Discrimination of quantum observables using limited resources



: Ziman M, Heinosaari T

Publisher: AMER PHYSICAL SOC

: 2008

 Physical Review A

: PHYSICAL REVIEW A

: PHYS REV A

: ARTN 042321

: 77

: 4

: 7

: 1050-2947

DOI: https://doi.org/10.1103/PhysRevA.77.042321


We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in detail the case of qubit observables. In particular, we show that perfect discrimination with two shots is possible only for sharp qubit observables (e.g., Stern-Gerlach apparatuses) associated with mutually orthogonal directions. We also show that for sharp qubit observables associated to nonorthogonal directions unambiguous discrimination with an inconclusive result is always possible.



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