Design and Analysis of a Flip-Chip Architecture for SAW-DQD Strong Coupling

Surface acoustic wave (SAW) resonators offer distinct advantages for coupling to semiconductor qubits, including low loss, high stability, and compatibility with magnetic fields. However, the integration of SAW resonators with double quantum dots (DQDs) which host charge and spin qubits remains largely unexplored. In this work, we propose a flip-chip architecture that enables three-dimensional integration of a semiconductor DQD with a SAW resonator. Taking experimental feasibility into account, we estimate the coupling strength between a DQD and a SAW resonator. The results suggest that strong coupling regime can be reached in our design. This study provides theoretical insight and practical guidance for experimental exploration of phonon-electron coupling in hybrid SAW-DQD quantum systems.