A1 Refereed original research article in a scientific journal
Discrimination of quantum observables using limited resources
Authors: Ziman M, Heinosaari T
Publisher: AMER PHYSICAL SOC
Publication year: 2008
Journal:Physical Review A
Journal name in sourcePHYSICAL REVIEW A
Journal acronym: PHYS REV A
Article number: ARTN 042321
Volume: 77
Issue: 4
Number of pages: 7
ISSN: 1050-2947
DOI: https://doi.org/10.1103/PhysRevA.77.042321
Abstract
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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