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Opt Lett. 2009 May 1;34(9):1444-6.

Wigner function of pulsed fields by direct detection.

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  • 1National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Como, I-22100, Italy.


We present the reconstruction of the Wigner function of some classical pulsed optical states obtained by direct measurement of the detected-photon probability distributions of the state displaced by a coherent field. We use a photodetector endowed with internal gain, which is operated in the non-photon-resolving regime. The measurements are performed up to mesoscopic intensities (up to more than 30 photons per pulse). The method can be applied to characterize nonclassical continuous-variable states.

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