Publication: Unpolarized states and hidden polarization
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2014-10-15
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American Physical Society
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Abstract
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.
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©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.
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