Circuit Quantum Acoustodynamics in a Scalable Phononic Integrated Circuit Architecture

• URL: http://arxiv.org/abs/2512.04953v1
• Date: Thu, 04 Dec 2025 16:21:47 GMT
• Title: Circuit Quantum Acoustodynamics in a Scalable Phononic Integrated Circuit Architecture
• Authors: 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,
• Abstract summary: We demonstrate a scalable architecture for circuit quantum acoustodynamics (cQAD) by integrating superconducting qubits with suspension-free phononic integrated circuits (PnICs)<n>Coherent coupling between tunable transmon qubits and waveguide-integrated phononic cavities has been achieved, producing a pronounced enhancement of phonon emission with a Purcell factor of 19.
• Score: 11.756855104196609
• License: http://creativecommons.org/licenses/by/4.0/
• 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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