Collective Dynamics in Circuit Quantum Acoustodynamics with a Macroscopic Resonator

Quantum Physics [Submitted on 21 Mar 2026] Collective Dynamics in Circuit Quantum Acoustodynamics with a Macroscopic Resonator Libo Zhang, Chilong Liu, Guixu Xie, Haolan Yuan, Mingze Liu, Hao Jia, Jian Li, Chang-Kang Hu, Song Liu, Alan C. Santos, Dian Tan, Dapeng Yu 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. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.20800 [quant-ph]   (or arXiv:2603.20800v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.20800 Focus to learn more Submission history From: Dian Tan [view email] [v1] Sat, 21 Mar 2026 12:51:10 UTC (6,622 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)