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Title: Degrees of polarization for a quantum field
Author: Sanchez-Soto, L.L.
Soderholm, J.
Yustas, E.C.
Klimov, Andrei B.
Bjork, G.
Issue Date: 2006
Abstract: Unpolarized light is invariant with respect to any SU(2) polarization transformation. Since this 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 discuss different candidates of distance, and show that they induce fundamentally different degrees of polarization. � 2006 IOP Publishing Ltd.
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