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oai:docta.ucm.es:20.500.14352/338752023-08-25T10:59:43Zcom_20.500.14352_14col_20.500.14352_15

Unpolarized states and hidden polarization Hoz Iglesias, Pablo de la Björk, G. Klimov, Andrei B. Leuchs, Gerd Sánchez Soto, Luis Lorenzo 535 Light Radiation Óptica (Física) 2209.19 Óptica Física ©2014 American Physical Society. Financial support from the Swedish Foundation for International Cooperation in Research and Higher Education (STINT), the Swedish Research Council (VR) through its Linnæus Center of Excellence ADOPT and Contract No. 621-2011-4575, the Mexican CONACyT (Grant No. 106525), the EU FP7 (Grant Q-ESSENCE), and the Spanish MINECO (Grant No. FIS2011-26786) is gratefully acknowledged. We capitalize on a multipolar expansion of the polarization density matrix, in which multipoles appear as successive moments of the Stokes variables. When all the multipoles up to a given order K vanish, we can properly say that the state isKth-order unpolarized, as it lacks of polarization information to that order. First-order unpolarized states coincide with the corresponding classical ones, whereas unpolarized to any order tally with the quantum notion of fully invariant states. In between these two extreme cases, there is a rich variety of situations that are explored here. The existence of hidden polarization emerges in a natural way in this context. Swedish Foundation for International Cooperation in Research and Higher Education (STINT) Swedish Research Council (VR) Linnæus Center of Excellence Mexican CONACyT Ministerio de Economía y Competitividad (MINECO), España Depto. de Óptica Fac. de Ciencias Físicas TRUE pub 2023-06-19T13:29:58Z 2023-06-19T13:29:58Z 2014-10-15 journal article https://hdl.handle.net/20.500.14352/33875 1050-2947 10.1103/PhysRevA.90.043826 eng 621-2011-4575 106525 FIS2011-26786 open access application/pdf American Physical Society