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Coincidence-structures in the transverse plane of Type-II spontaneousparametric down-conversion carrying orbital angular momentum are obtained.Azimuthal symmetry breaking around the pump beam direction reveals itself onthese quantum images. Analytical expressions for the amplitude probability ofthe down conversion process are shown including the nonlinear polarizabilitycomponents.

Transverse coincidence-structures in spontaneous parametric down-conversion with orbital angular momentum: Theory