Distance-based degrees of polarization for a quantum field

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dc.creatorKlimov, A. B.
dc.creatorSanchez-Soto, L. L.
dc.creatorYustas, E. C.
dc.creatorSoderholm, J.
dc.creatorBjork, G.
dc.date2005-04-29
dc.date.accessioned2026-07-07T06:30:47Z
dc.date.available2026-07-07T06:30:47Z
dc.descriptionIt is well established that unpolarized light is invariant with respect to any SU(2) polarization transformation. This requirement fully characterizes the set of density matrices representing unpolarized states. We introduce the degree of polarization of a quantum state as its distance to the set of unpolarized states. We use two different candidates of distance, namely the Hilbert-Schmidt and the Bures metric, showing that they induce fundamentally different degrees of polarization. We apply these notions to relevant field states and we demonstrate that they avoid some of the problems arising with the classical definition.
dc.description8 pages, 1 eps figure
dc.identifierhttps://arxiv.org/abs/quant-ph/0504226
dc.identifierhttp://arxiv.org/abs/quant-ph/0504226
dc.identifierPhys.Rev. A72 (2005) 033813
dc.identifierdoi:10.1103/PhysRevA.72.033813
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98429
dc.subjectQuantum Physics
dc.titleDistance-based degrees of polarization for a quantum field
dc.typetext

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