It is interesting to note that the energy-conserving correction in CTMQC-E improves on the performance of CTMQC. In addition, the poor performance of CTTSH is probably due to the incorrect prediction at very short times of the population exchange between S 1 and S 2 . This disagreement of CTTSH with the reference has been ascribed to the problem of frustrated hops, affecting equally CTTSH and surface hopping. Therefore, further studies will be focused on treating the problem of frustrated hops in CTTSH reformulating energy conservation and the hopping probability in a way that is more adequate to the coupledtrajectory nature of CTTSH than the current implementation.