Hybrid acousto-optical swing-up state control in a quantum dot

State transfer between different quantum systems is key for successful quantum technologies. Over long distances, photons are irreplaceable, but on short ranges in miniaturized complex devices or hybrid systems, coupling via orders of magnitude shorter wavelength acoustic waves has great potential. With interfaces to light, acoustic waves, and more, optically active quantum dots (QDs) are essential for multi-component systems. Here, we propose a hybrid acousto-optical method of non-resonant QD charge state control as an extension of the recent all-optical swing-up state preparation. We show that exciton and biexciton states or other superpositions of charge states can be prepared. Each field can act as a trigger, so an optically gated acoustic control and the opposite scheme, where an optical pulse controls the transition during acoustic modulation, can be implemented. Thus, we introduce acoustic state control into a system that lacks direct acoustic coupling between the states. The method does not rely on pulse shaping and is expected to work with arbitrary pulse shapes. Evaluating the phonon impact, we find an almost decoherence-free exciton preparation even at elevated temperatures with current QD and acoustic technology. This approach may also pave the way for optically controlled entanglement between emitters and acoustic modes and further on-chip state transfer via quantum acoustic busses.