2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89187We show that shifts in locations of two-photon coincidence spectral peaks, for a bichromatically-driven two-level atom passing through a single-mode cavity, are due to competition between excitation pathways for a Jaynes-Cummings system. We also discuss an analogous shift of (single-photon) spectral peaks for a driven three-level V-system, which demonstrates that competition between excitation pathways is also important in this simple system.7 pages, 6 figuresQuantum Physicstext