Movie S1.

Correlated electron-photon propagation with nonfactorizable initial state and driven by external laser pulse: Initially the system populated the combined electron–photon ground state. Upper Left shows the applied external laser pulse, Second on the Left shows the exact (black) and classical (red) dipole moment. Third on the Left shows the projections of the time-dependent wave function on the first three electronic eigenstates. Lower Left shows the evolution of the Mandel Q(t) parameter and purity γ(t) for exact (black) and classical approximation (red). Upper Right shows the exact mean-field exchange correlation (vMxc(r,t)) potential and Lower Right shows the corresponding electronic density.