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arXiv · 2404.18540

Tunable coupling of a quantum phononic resonator to a transmon qubit with flip-chip architecture

Xinhui Ruan·Li Li·Guihan Liang·Silu Zhao·Jia-heng Wang·Yizhou Bu·Bingjie Chen·Xiaohui Song·Xiang Li·He Zhang·Jinzhe Wang·Qianchuan Zhao·Kai Xu·Heng Fan·Yu-xi Liu·Jing Zhang·Zhihui Peng·Zhongcheng Xiang·Dongning Zheng
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Abstract

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 $2\pi\times$7.0 MHz to -$2\pi\times$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.

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Xinhui Ruan, Li Li, Guihan Liang, Silu Zhao, Jia-heng Wang, Yizhou Bu, Bingjie Chen, Xiaohui Song, Xiang Li, He Zhang, Jinzhe Wang, Qianchuan Zhao, Kai Xu, Heng Fan, Yu-xi Liu, Jing Zhang, Zhihui Peng, Zhongcheng Xiang, Dongning Zheng. 2024-04-29. Tunable coupling of a quantum phononic resonator to a transmon qubit with flip-chip architecture. https://doi.org/10.1063/5.0216607

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