Hybrid Quantum Surface Acoustic Wave with Skyrmion Qubit for Quantum Information Processing

Surface acoustic wave (SAW) devices are key components of classical communication systems and recently studied for quantum information processing. We here propose and study a hybrid quantum system composed of skyrmion qubit and a SAW cavity, which supports multiple long-lived phononic modes. The system allows for strong coupling between single skyrmion qubit and single phonon of different modes. By manipulating the qubit through a static magnetic field and a time-dependent modulation magnetic field, we further study the interaction between skyrmion qubit and individual phononic modes, phonon-phonon interaction, and qubit-qubit interaction, all operating in strong-coupling regime. The controllability of nanoscale skyrmion qubit and the dense phononic modes of single SAW cavity make our system have promising applications in large-scale chips for quantum communication and computing.