Tunable coupling of a quantum phononic resonator to a transmon qubit via galvanic-contact flip-chip architecture

• Published in: Applied physics letters Vol. 125; no. 5
• Main Authors: Ruan, Xinhui, Li, Li, Liang, Guihan, Zhao, Silu, Wang, Jia-heng, Bu, Yizhou, Chen, Bingjie, Song, Xiaohui, Li, Xiang, Zhang, He, Wang, Jinzhe, Zhao, Qianchuan, Xu, Kai, Fan, Heng, Liu, Yu-xi, Zhang, Jing, Peng, Zhihui, Xiang, Zhongcheng, Zheng, Dongning
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 29-07-2024
• Subjects: Acoustics; Coupling; Data processing; Hybrid systems; Phonons; Quantum phenomena; Qubits (quantum computing); Resonators; Surface acoustic wave devices
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/5.0216607

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 resonator and a transmon qubit based on the galvanic-contact flip-chip technique. The coupling strength varies from
2
π
× 7.0 to −
2
π
× 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.