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Impact of FWM Process on the Statistics of a Co-Propagating Quantum Signal in a WDM Lightwave System

Almeida, A. ; Silva, N. A. ; André, P.S ; Pinto, A. N.

Impact of FWM Process on the Statistics of a Co-Propagating Quantum Signal in a WDM Lightwave System, Proc International Conf. on Transparent Optical Networks - ICTON, Coventry, United Kingdom, Vol. 1, pp. Tu.P.6-1 - Tu.P.6-4, July, 2012.

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Abstract
We present an experimental characterization of the evolution of the photon statistics of a quantum signal, in a
wavelength-division multiplexing (WDM) environment. We use an on/off avalanche photodetector operating in
the Geiger mode to measure the photon counts, and the maximum-likelihood estimation (MLE) method and the
expectation-maximization (EM) algorithm to reconstruct the photon statistics. We found that the statistics of the
quantum signal changes from Poissonian to thermal when it contains only a few photons per pulse. When the
quantum signal carries a higher number of photons per pulse, it is verified that its statistics remains Poissonian.