Photocount measurements as a tool for investigation of non-classical properties of twin beams

摘要: ABSTRACT Joint signal-idler photoelectron distributions of twin beams have been measured recently in two distinct regimes:either the mean number photon pairs per one pump pulse is lower that independent modes orvice versa. Exploiting a microscopic quantum theory for joint quasi-distributions parametric down-conversionbased on model superposition signal and noise we characterize properties terms using experimental data. In parallel to model, photon-numberdistribution reconstructed method maximum likelihood. Negative values as well oscillatingbehavior region are characteristic integrated intensities.The larger mode weaker features are. However, theysurvive even mesoscopic regime, i.e. when tens present average. Alsothe conditional dierence photon-number shown be sub-Poissonian sub-shot-noise,respectively. Violation classical inequalities discussed.Keywords: pair, beam, distribution