  We analyze the real-time electron-photon dynamics in long-range
polariton-mediated energy transfer using a real-time quantum electrodynamics
coupled cluster (RT-QED-CC) model, which allows for spatial and temporal
visualization of transport processes. We compute the time evolution of photonic
and molecular observables, such as the dipole moment and the photon coordinate,
following the excitation of the system induced by short laser pulses. Our
simulation highlights the different time scales of electrons and photons under
light-matter strong coupling, the role of dark states, and the differences with
the electronic (F\"orster and Dexter) energy exchange mechanisms. The developed
method can simulate multiple high-intensity laser pulses while explicitly
retaining electronic and electron-photon correlation and is thus suited for
nonlinear optics and transient absorption spectroscopies of molecular
polaritons.
