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Title: Classical distinguishability as an operational measure of polarization
Author: Bjork, G.
De Guise, H.
Klimov, Andrei B.
De La Hoz, P.
Sanchez-Soto, L.L.
Issue Date: 2014
Abstract: We put forward an operational degree of polarization that can be extended in a natural way to fields whose wave fronts are not necessarily planar. This measure appears as a distance from a state to the set of all of its polarization-transformed counterparts. By using the Hilbert-Schmidt metric, the resulting degree is a sum of two terms: one is the purity of the state and the other can be interpreted as a classical distinguishability, which can be experimentally determined in an interferometric setup. For transverse fields, this reduces to the standard approach, whereas it allows one to get a straight expression for nonparaxial fields. © 2014 American Physical Society.
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