2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/159253An exact analytic solution is presented for coherent resonant excitation of a two-state quantum system driven by a time-dependent pulsed external field with a hyperbolic-secant shape in the presence of dephasing. Analytic results are derived for the amplitude and the phase shift of the damped Rabi oscillations.5 pages, 2 figuresQuantum Physicstext