The strong coupling of atoms and molecules to radiation field modes in optical cavities creates dressed matter/field states known
as polaritons with controllable dynamical and energy transfer properties. We propose a multidimensional optical spectroscopy
technique for monitoring polariton dynamics. The response of a two-level atom to the time-dependent coupling to a singlecavity
mode is monitored through time-and-frequency–resolved single-photon coincidence measurements of spontaneous emission.
Polariton population and coherence dynamics and its variation with cavity photon number and controlled by gating parameters
are predicted by solving the Jaynes–Cummings model.

Proc. Natl. Acad .Sci. 115, 1451 (2018).pdf