Fig. presents k/k 0 obtained from various other MQC methods and compares them with the HEOM results in panel (a). These MQC methods include (b) the Ehrenfest dynamics, (c) the trajectory surface hopping method with the global flux algorithm, and (d) the spin-LSC approach. As one can clearly see, all of these trajectory-based methods semi-quantitatively capture the correct VSC resonance behavior, where the maximum of the rate constant enhancement occurs at ω c ≈ ω 0 . Of course, some methods are more accurate than others in terms of the quantitative accuracy of k/k 0 , where GFSH seems to be the least accurate and spin-LSC seems to be providing more accurate values of k/k 0 that is consistent with γ-SQC (see Fig. ), although exhibiting some slightly negative populations (see Fig. in the Supporting Information) due to the feature of this mapping based approach. These results confirm our hypotheses that the correct VSC resonance condition (Eq. 1) will emerge as long as one includes the key vibrational states inside the quantum subsystem.