RT Journal Article T1 Dynamics of a two-level atom observed via an interaction-free measurement A1 Luis Aina, Alfredo A1 Sánchez Soto, Luis Lorenzo AB We examine the evolution of a two-level atom when its population is monitored. The detection proposed is an interaction-fret measurement, so that the observation occurs without photon exchange between the atom and the apparatus. It is shown that the observed dynamics exhibits features that an isolated two-level atom cannot accommodate. Such phenomena are explained in terms of an atom-apparatus effective interaction. PB American Physical Society SN 1050-2947 YR 1999 FD 1999-07 LK https://hdl.handle.net/20.500.14352/59686 UL https://hdl.handle.net/20.500.14352/59686 LA eng NO ©1999 The American Physical Society DS Docta Complutense RD 10 may 2025