62 citations · 111 across the 6 of their papers we have counts for
5 papers · 1 filter
The canonical phase measurement is pure
Teiko Heinosaari, Juha-Pekka Pellonpää
We show that the canonical phase measurement is pure in the sense that the corresponding positive operator valued measure (POVM) is extremal in the convex set of all POVMs. This me…
Coexistence of qubit effects
Peter Stano, Daniel Reitzner, Teiko Heinosaari
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. Th…
Approximate Joint Measurability of Spin Along Two Directions
Teiko Heinosaari, Peter Stano, Daniel Reitzner
We study the existence of jointly measurable POVM approximations to two non-commuting sharp spin observables. We compare two different ways to specify optimal approximations.
Discrimination of quantum observables using limited resources
Mario Ziman, Teiko Heinosaari
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 observabl…
Approximate joint measurements of qubit observables
Paul Busch, Teiko Heinosaari
Joint measurements of qubit observables have recently been studied in conjunction with quantum information processing tasks such as cloning. Considerations of such joint measuremen…