A scalable hybrid cavity quantum acoustodynamics (QAD) platform is proposed. The architecture integrates superconducting transmon qubits with phononic integrated circuits on a single chip made by lithium niobate-on-sapphire substrate. The platform supports tightly confined and guided phononic modes in unsuspended waveguides and microring structures, while the superconducting qubits reside on the sapphire substrate. Efficient piezoelectric coupling between the phononic modes and transmon qubits can be achieved using interdigital transducers as part of the qubit's shunt capacitance. Numerical calculations demonstrate the feasibility of achieving strong coupling between the phononic microring resonator and the transmon qubit. This hybrid cavity QAD platform opens up new opportunities for quantum information processing and the study of novel quantum acoustic phenomena.
@article{arxiv.2509.14728,
title = {Proposal of cavity quantum acoustodynamics platform based on Lithium Niobate-on-Sapphire chip},
author = {Xin-Biao Xu and Lintao Xiao and Bo Zhang and Weiting Wang and Jia-Qi Wang and Yu Zeng and Yuan-Hao Yang and Bao-Zhen Wang and Xiaoxuan Pan and Guang-Can Guo and Luyan Sun and Chang-Ling Zou},
journal= {arXiv preprint arXiv:2509.14728},
year = {2025}
}