Quantum images in double-slit experiments with spontaneous down-conversion light

Summary form only given. This work analyzes patterns seen when a signal beam of spontaneous parametric downconverted light illuminates a double-slit (Young) and a coincidence pattern ("object") appears on scanning behind the double-slit arrangement and, conversely, when the conjugated idler beam is scanned spatially keeping the signal detector fixed and a "Young" coincidence pattern ("image") is revealed. Mandel\´s theory for downconversion is applied, in the (r)-space, to this analysis.