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Updated: Aug 23, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Entropy and degree of polarization for nonlinear optical waves
1Centre National de la Recherche Scientifique, Laboratoire de Physique de la Matière Condonsée, Université de Nice Sophia-Antipolis, Nice, France. picozzi@unice.fr
Abstract:
I show that the usual definitions of entropy and degree of polarization are not relevant for nonlinear optical waves, because they would lead to the erroneous conclusion that a genuine process of reversible propagation would be characterized by an irreversible process of entropy production. To circumvent this problem, I propose appropriate definitions of entropy and degree of polarization that depend on all the statistical moments of the nonlinear wave, so that they exhibit the satisfactory property to be conserved during a reversible propagation process.
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