%0 Journal Article
%T Absolute Quantum Efficiency Measurements by Means of Conditioned Polarization Rotation
%A Giorgio Brida
%A Maria Chekhova
%A Marco Genovese
%A Marco Gramegna
%A Leonid Krivitsky
%A Maria Luisa Rastello
%J Physics
%D 2005
%I arXiv
%X We propose a new scheme for measuring the quantum efficiency of photon counting detectors by using correlated pho-tons. The measurement technique is based on a 90 rotation of the polarization of one photon member of a correlated pair produced by parametric down-conversion, conditioned on the detection of the other correlated photon after polarization selection. We present experimental results obtained with this scheme.
%U http://arxiv.org/abs/quant-ph/0506166v1