State reconstruction of a multimode twin beam using photodetection

Abstract

Robust and reliable method for reconstructing quasi-distributions of integrated intensities of twin beams generated in spontaneous parametric down-conversion and entangled in photon numbers is suggested. It utilizes the first and second photocount moments and minimizes the declination from experimental photocount histograms. Qualitatively different forms of quasi-distributions for quantum and classical states are suggested in the method. The transition from quantum to classical states caused by an increased detection noise is discussed. Momentum criterion for non-classicality of twin beams is suggested.

6 pages, 4 figures

References in corpus (2)

• Measurement of sub-shot-noise spatial correlations without subtraction of background
• Direct observation of non-classical photon statistics in parametric downconversion

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