Entanglement-assisted calibration of a photon-number-resolving detector
Fabrizio Piacentini, G. Brida, L. Ciavarella, Mario Dagrada, Ivo Pietro Degiovanni, Marco Genovese, Alan L. Migdall, M. G. Mingolla, Matteo G. A. Paris, Sergey V. Polyakov · 2012
Here we present the first experimental entanglement-assisted quantum char-acterization of an unknown photon-number-resolving detector, i.e. the reconstruction of its positive operator-valued measure (POVM), obtained by exploiting the quantum correlations of a twin-beam generated by parametric down conversion (PDC).