RT Journal Article T1 Classical distinguishability as an operational measure of polarization A1 Björk, G. A1 de Guise, H. A1 Klimov, Andrei B. A1 Hoz Iglesias, Pablo de la A1 Sánchez Soto, Luis Lorenzo AB 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. PB American Physical Society SN 1050-2947 YR 2014 FD 2014-07-23 LK https://hdl.handle.net/20.500.14352/33947 UL https://hdl.handle.net/20.500.14352/33947 LA eng NO © 2014 American Physical Society. The work of G.B. is supported by the Swedish Foundation for International Cooperation in Research and Higher Education (STINT), and the Swedish Research Council (VR) through its Linnæus Center of Excellence ADOPT and Contract No. 621-2011-4575. H.d.G. is supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada. A.K. is thankful for the financial assistance of the Mexican CONACyT (Grant No. 106525). Finally, P.H. and L.L.S.S. acknowledge the support from the Spanish MINECO (Grant No. FIS2011-26786). It is also a pleasure to thank I. Bengtsson, J. J. Monzón, and G. Leuchs for stimulating discussions. NO Spanish MINECO NO Swedish Foundation for International Cooperation in Research and Higher Education (STINT) NO Swedish Research Council (VR) through its Linnæus Center of Excellence ADOPT NO Natural Sciences and Engineering Research Council (NSERC) of Canada NO Mexican CONACyT DS Docta Complutense RD 7 abr 2025