title: Positive operator-valued measure reconstruction of a beam-splitter tree-based photon-number-resolving detector.
abstract: Here we present a reconstruction of the positive operator-value measurement of a photon-number-resolving detector comprised of three 50∶50 beam-splitters in a tree configuration, terminated with four single-photon avalanche detectors. The four detectors' outputs are processed by an electronic board that discriminates detected photon number states from 0 to 4 and implements a "smart counting" routine to compensate for dead time issues at high count rates.
authors.forename: F
authors.initials: F
authors.lastname: Piacentini
authors.forename: M P
authors.initials: MP
authors.lastname: Levi
authors.forename: A
authors.initials: A
authors.lastname: Avella
authors.forename: M
authors.initials: M
authors.lastname: López
authors.forename: S
authors.initials: S
authors.lastname: Kück
authors.forename: S V
authors.initials: SV
authors.lastname: Polyakov
authors.forename: I P
authors.initials: IP
authors.lastname: Degiovanni
authors.forename: G
authors.initials: G
authors.lastname: Brida
authors.forename: M
authors.initials: M
authors.lastname: Genovese