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Discrimination of quantum observables using limited resources
Tekijät: Ziman M, Heinosaari T
Kustantaja: AMER PHYSICAL SOC
Julkaisuvuosi: 2008
Lehti:Physical Review A
Tietokannassa oleva lehden nimiPHYSICAL REVIEW A
Lehden akronyymi: PHYS REV A
Artikkelin numero: ARTN 042321
Vuosikerta: 77
Numero: 4
Sivujen määrä: 7
ISSN: 1050-2947
DOI: https://doi.org/10.1103/PhysRevA.77.042321
Tiivistelmä
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.
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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