RT Journal Article T1 SU(2) coherent states in parametric down-conversion A1 Luis Aina, Alfredo A1 Peřina, J. AB 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. PB American Physical Society SN 1050-2947 YR 1996 FD 1996-03 LK https://hdl.handle.net/20.500.14352/59730 UL https://hdl.handle.net/20.500.14352/59730 LA eng NO © 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. NO Ministerio de Educación y Ciencia (MEC), España DS Docta Complutense RD 7 abr 2025