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SU(2) coherent states in parametric down-conversion Luis Aina, Alfredo Peřina, J. 535 Quantum-optics Interference Óptica (Física) 2209.19 Óptica Física © 1996 The American Physical Society. We would like to thank Professor V. Peřinová and Dr. A. Lukš for carefully reading the manuscript. A.L. also acknowledges the support of a grant from the Ministerio Español de Educación y Ciencia and the kind hospitality from the Optics Department of the Palacký University. The states generated from the vacuum in two parametric down-conversion crystals with aligned idler beams are studied. It is shown that after a measurement of the photon number in some of the modes, the emerging states can be related to SU(2) and SU(1,1) coherent acid minimum-uncertainty states. Ministerio de Educación y Ciencia (MEC), España Depto. de Óptica Fac. de Ciencias Físicas TRUE pub 2023-06-20T20:10:04Z 2023-06-20T20:10:04Z 1996-03 journal article https://hdl.handle.net/20.500.14352/59730 1050-2947 10.1103/PhysRevA.53.1886 eng open access application/pdf American Physical Society