Collective Dynamics in Circuit Quantum Acoustodynamics with a Macroscopic Resonator
Abstract
Collective dynamics in engineered quantum systems offer a unique and versatile platform for exploring how many-body correlations bridge microscopic entanglement and macroscopic behavior. In this work, we report collective Dicke dynamics of acoustic modes in a macroscopic high-overtone bulk acoustic resonator (HBAR). To achieve this, we engineer a hybrid quantum acoustodynamic system comprising an HBAR strongly coupled to a superconducting transmon qubit. The HBAR device is distinctive in the sense that its narrow mode spacing, together with enhanced qubit-mode coupling strength, gives rise to efficient coupling between the transmon and clusters of near-resonant modes. By harnessing the system properties, we observe collective dynamics involving clusters composed by two or three mechanical modes, where their non-resonant spectrum allows for the observation of the transition between the Dicke static regime to dynamically induced timed-Dicke one. The coherent collective behavior of the system is supported by time-domain measurements of the qubit's purity, indicating the quantum nature of the collective dynamics. Overall, our work establishes HBAR-based hybrid quantum system as a promising platform for exploring many-body collective dynamics in macroscopic mechanical systems.
Cite
@article{arxiv.2603.20800,
title = {Collective Dynamics in Circuit Quantum Acoustodynamics with a Macroscopic Resonator},
author = {Libo Zhang and Chilong Liu and Guixu Xie and Haolan Yuan and Mingze Liu and Hao Jia and Jian Li and Chang-Kang Hu and Song Liu and Alan C. Santos and Dian Tan and Dapeng Yu},
journal= {arXiv preprint arXiv:2603.20800},
year = {2026}
}