Figure 1.

Uracil photorelaxation dynamics under free evolution. (a) Main coordinates dominating the photorelaxation in uracil from the S₂ state. Absent cavity, the WP oscillates for more than 100 fs along the q_osc coordinate, until it manages to overcome the barrier (panel b) along q_relax. (c) State populations over evolution time. The light blue line shows the total population of the protected wavepacket. Once the WP starts overcoming the barrier, it can reach the S₂/S₁ conical intersection, and it is quickly transferred to the |S₁, 0⟩ state (where S₁ denotes the excitonic state, while the second index gives the photon number).