. . . "RIV/00216224:14330/08:00024784!RIV10-GA0-14330___" . "We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in details 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."@en . "Discrimination of quantum observables"@en . . . "We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in details 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." . . "P(GA201/07/0603), Z(MSM0021622419)" . . "Discrimination of quantum observables" . . "Ziman, M\u00E1rio" . . "363776" . "1"^^ . . . "Discrimination of quantum observables" . "14330" . . "Discrimination of quantum observables"@en . "quantum information; quantum estimation"@en . . . . "RIV/00216224:14330/08:00024784" . "[DD0FFD3DE4C5]" . "1"^^ . .