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

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...

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Veröffentlicht in:arXiv.org 2023-04
Hauptverfasser: Lee, Nathan R A, Guo, Yudan, Cleland, Agnetta Y, Wollack, E Alex, Gruenke, Rachel G, Makihara, Takuma, Wang, Zhaoyou, Taha Rajabzadeh, Jiang, Wentao, Mayor, Felix M, Arrangoiz-Arriola, Patricio, Sarabalis, Christopher J, Safavi-Naeini, Amir H
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Sprache:eng
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Zusammenfassung: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.
ISSN:2331-8422