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dc.contributor.authorKlimov, Andrei B.
dc.contributor.authorSanchez-Soto, L.L.
dc.contributor.authorYustas, E.C.
dc.contributor.authorSoderholm, J.
dc.contributor.authorBjork, G.
dc.description.abstractIt 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. � 2005 The American Physical Society.
dc.titleDistance-based degrees of polarization for a quantum field
dc.relation.ispartofjournalPhysical Review A - Atomic, Molecular, and Optical Physics
dc.contributor.affiliationKlimov, A.B., Departamento de F�sica, Universidad de Guadalajara, 44420 Guadalajara, Jalisco, Mexico; S�nchez-Soto, L.L., Departamento de �ptica, Facultad de F�sica, Universidad Complutense, 28040 Madrid, Spain; Yustas, E.C., Departamento de �ptica, Facultad de F�sica, Universidad Complutense, 28040 Madrid, Spain; S�derholm, J., Institute of Quantum Science, Nihon University, 1-8 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan; Bj�rk, G., School of Information and Communication Technology, Royal Institute of Technology (KTH), Electrum 229, SE-164 40 Kista, Sweden
dc.contributor.affiliationKlimov, Andrei B., Universidad de Guadalajara. Centro Universitario de Ciencias Exactas e Ingenier�as
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