115 citations · 425 across the 28 of their papers we have counts for
3 papers · 1 filter
Weak vs. approximate values in quantum state determination
Erkka Haapasalo, Pekka Lahti, Jussi Schultz
We generalize the concept of a weak value of a quantum observable to cover arbitrary real positive operator measures. We show that the definition is operationally meaningful in the…
Extreme Covariant Quantum Observables in the Case of an Abelian Symmetry Group and a Transitive Value Space
Erkka Haapasalo, Juha-Pekka Pellonpää
We represent quantum observables as POVMs (normalized positive operator valued measures) and consider convex sets of observables which are covariant with respect to a unitary repre…
Quantum measurements on finite dimensional systems: relabeling and mixing
Erkka Haapasalo, Teiko Heinosaari, Juha-Pekka Pellonpää
Concentrating on finite dimensional systems, we show that one can limit to extremal rank-1 POVMs if two simple procedures of mixing and relabeling are permitted. We demonstrate tha…