Competition-induced shifts of spectral peaks in photon coincidence spectroscopy

A study of the shifts in two-photon coincidence spectral peaks for a bichromatically driven two-level atom passing through a single-mode cavity was performed. The shifts in the locations were due to competition between excitation pathways for a Jaynes-Cummings (JC) system. The study also reflected an analogus shift of spectral peaks for a driven three-level V system. It was found that the quantum jump terms to the net peak shift was more significant for the monochromatically driven V system than the bichromatically driven JC system.