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Conference on Lasers and Electro-Optics

Full mode reconstruction of a light field via a photon-number resolved measurement

Ivan A. Burenkov, Ankita K. Sharma, Thomas Gerrits, Georg Harder, Tim J. Bartley, Christine Silberhorn, Elizabeth A. Goldschmidt, Sergey V. Polyakov

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We present a method to reconstruct the mode structure of multimode conjugated optical fields using an experimentally measured joint photon-number probability distribution. We reconstructed a mode structure of a bright parametric down-conversion source.
DOI
10.1364/cleo_qels.2016.ftu3c.3

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We present a method to reconstruct the complete statistical mode structure and optical losses of multimode conjugated optical fields using an experimentally measured joint photon-number probability distribution. We demonstrate that this method evaluates classical and nonclassical properties using a single measurement technique and is well suited for quantum mesoscopic state characterization. We obtain a nearly perfect reconstruction of a field comprised of up to ten modes based on a minimal set of assumptions. To show the utility of this method, we use it to reconstruct the mode structure of an unknown bright parametric down-conversion source.
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Optical parametric down-conversion is a common source for the generation of nonclassical correlated photonic states. Using a parametric down-conversion source and photon-number-resolving detectors, we measure the two-mode photon-number distribution of up to 10 photons for different degrees of correlation. The degree of correlation is controlled by collecting different spatial and spectral single modes for each polarization and varying the amount of spectral and spatial overlap between them. Clear evidence for photon-number correlations is presented despite detector imperfections such as low detection efficiency and other distorting effects. Two criteria, derived directly from the raw data, are shown to be good measures for the degree of correlation. Additionally, using a fitting technique, we find a connection between the measured photon-number distribution and the degree of correlation of the reconstructed original two-mode state. These observations are only possible as a result of the detection of high photon number events.