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We study the behaviour of the Negativity of Wigner Function (NWF) as ameasure of entanglement in non-Gaussian states under quantum polarisationconverter devices. We analyze comparatively this quantity with other measuresof entanglement in a system prepared in a superposition of two-mode coherentstates. We show that the (WF) can be identified as a quantifier of non-Gaussianentanglement.

On the negativity of the Wigner function as a measure of entanglement under quantum polarization converter devices