A hybrid system with tunable coupling between phonons and qubits shows great potential for advancing quantum information processing. In this work, we demonstrate strong and tunable coupling between a surface acoustic wave (SAW) resonator and a transmon qubit based on galvanic-contact flip-chip technique. The coupling strength varies from 2π×7.0 MHz to -2π×20.6 MHz, which is extracted from different vacuum Rabi oscillation frequencies. The phonon-induced ac Stark shift of the qubit at different coupling strengths is also shown. Our approach offers a good experimental platform for exploring quantum acoustics and hybrid systems.
@article{arxiv.2404.18540,
title = {Tunable coupling of a quantum phononic resonator to a transmon qubit with flip-chip architecture},
author = {Xinhui Ruan and Li Li and Guihan Liang and Silu Zhao and Jia-heng Wang and Yizhou Bu and Bingjie Chen and Xiaohui Song and Xiang Li and He Zhang and Jinzhe Wang and Qianchuan Zhao and Kai Xu and Heng Fan and Yu-xi Liu and Jing Zhang and Zhihui Peng and Zhongcheng Xiang and Dongning Zheng},
journal= {arXiv preprint arXiv:2404.18540},
year = {2025}
}