Hegerfeldt, Gerhard C.Gerhard C.HegerfeldtMayato, R. SalaR. SalaMayato2018-11-072018-11-072012https://resolver.sub.uni-goettingen.de/purl?gro-2/26927Given an ensemble of systems in an unknown state, as well as an observable (A) over cap and a physical apparatus which performs a measurement of (A) over cap on the ensemble, whose detailed working is unknown ("black box"), we study how one can test whether the Luders or von Neumann reduction rule applies.journal_article10.1103/PhysRevA.85.032116000301333700007