Depolarization’s dynamic: exponential and q-exponential decay

Abstract

Light polarization is an important property that has being extensively used for quantum communication purposes. However, light polarization is also fragile and during propagation in a noisy channel the light becomes partially or even completely unpolarized, making impossible the realization of quantum protocols without polarization control. In this direction, the present work studies the dynamic of the depolarization of some noisy channels found in the literature identifying when the polarization vanishes exponentially and q-exponentially.