Strong dispersive coupling between a mechanical resonator and a fluxonium superconducting qubit

• URL: http://arxiv.org/abs/2304.13589v1
• Date: Wed, 26 Apr 2023 14:33:39 GMT
• Title: Strong dispersive coupling between a mechanical resonator and a fluxonium superconducting qubit
• Authors: Nathan R. A. Lee, Yudan Guo, Agnetta Y. Cleland, E. Alex Wollack, Rachel G. Gruenke, Takuma Makihara, Zhaoyou Wang, Taha Rajabzadeh, Wentao Jiang, Felix M. Mayor, Patricio Arrangoiz-Arriola, Christopher J. Sarabalis, Amir H. Safavi-Naeini
• Abstract summary: We extend the reach of circuit quantum acousto-dynamics experiments into a new range of frequencies. We have engineered a qubit-phonon coupling rate of $gapprox2pitimes14textMHz$, and achieved a dispersive interaction that exceeds the decoherence rates of both systems. Our results demonstrate the potential for fluxonium-based hybrid quantum systems, and a path for developing new quantum sensing and information processing schemes with phonons at frequencies below 700 MHz.
• Score: 1.3828553628764202
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate strong dispersive coupling between a fluxonium superconducting qubit and a 690 megahertz mechanical oscillator, extending the reach of circuit quantum acousto-dynamics (cQAD) experiments into a new range of frequencies. We have engineered a qubit-phonon coupling rate of $g\approx2\pi\times14~\text{MHz}$, and achieved a dispersive interaction that exceeds the decoherence rates of both systems while the qubit and mechanics are highly nonresonant ($\Delta/g\gtrsim10$). Leveraging this strong coupling, we perform phonon number-resolved measurements of the mechanical resonator and investigate its dissipation and dephasing properties. Our results demonstrate the potential for fluxonium-based hybrid quantum systems, and a path for developing new quantum sensing and information processing schemes with phonons at frequencies below 700 MHz to significantly expand the toolbox of cQAD.

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