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arXiv · 2512.04953

Circuit Quantum Acoustodynamics in a Scalable Phononic Integrated Circuit Architecture

Weiting Wang·Lintao Xiao·Bo Zhang·Yu Zeng·Ziyue Hua·Chuanlong Ma·Hongwei Huang·Yifang Xu·Jia-Qi Wang·Guangming Xue·Haifeng Yu·Xin-Biao Xu·Chang-Ling Zou·Luyan Sun
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Abstract

Previous demonstrations of quantum acoustic systems have been limited to isolated devices, with limited capability to route phonons and interconnect multi-port acoustic elements for further extension. Here, we demonstrate a scalable architecture for circuit quantum acoustodynamics (cQAD) by integrating superconducting qubits with suspension-free phononic integrated circuits (PnICs). Coherent coupling between tunable transmon qubits and waveguide-integrated phononic cavities, including Fabry-Perot cavities via monolithic integration and microring cavities via flip-chip assembly, has been achieved, producing a pronounced enhancement of phonon emission with a Purcell factor of ~19. These devices represent elementary building blocks for scalable phononic circuits, establishing the foundation for phonon-based quantum information processors and the testbed for novel quantum acoustic phenomena.

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Weiting Wang, Lintao Xiao, Bo Zhang, Yu Zeng, Ziyue Hua, Chuanlong Ma, Hongwei Huang, Yifang Xu, Jia-Qi Wang, Guangming Xue, Haifeng Yu, Xin-Biao Xu, Chang-Ling Zou, Luyan Sun. 2025-12-04. Circuit Quantum Acoustodynamics in a Scalable Phononic Integrated Circuit Architecture. https://arxiv.org/abs/2512.04953

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