  Quantum coherent control of bimolecular collisions beyond the ultracold
regime can face a major challenge due to the incoherent addition of different
partial wave contributions to the total scattering cross section. These
contributions become increasingly numerous as the collision energy increases,
leading to a loss of overall control. Here, we overcome this limitation by
leveraging the recently discovered Partial Wave Phase Locking (PWPL) effect,
which synchronizes the oscillations of all partial wave contributions. By using
rigorous quantum scattering calculations, we demonstrate that PWPL enables
coherent control of spin exchange in ion-atom collisions, far outside the
ultracold regime, even with as many as 5000 partial wave contributions. The
predicted extent of control is sufficient to be measurable in cold atom-ion
hybrid experiments.
