Multiphonon transitions in a quantum electromechanical system

ORAL

Abstract

We investigate and measure the multiphonon transitions of a system comprised of a superconducting qubit coupled to a high overtone bulk acoustic resonator (HBAR). The measured spectrums are found to show distinctly non-classical features, providing additional evidence for the quantization of GHz sound. These multiphonon peaks are found to shift with higher driving amplitude which is explained by the dressing of many multiphonon transitions, and a model is derived to calculate these shifts.

*We acknowledge the facilities and technical support of Otaniemi research infrastructure for Micro and Nanotechnologies (OtaNano) that is part of the EuropeanMicrokelvin Platform. This work was supported by the Academy of Finland (contracts 307757, 312057), by the European Research Council (615755-CAVITYQPD), by the Wihuri Foundation, and by the Aalto Centre for Quantum Engineering. The work was performed as part of the Academy of Finland Centre of Excellence program (project 336810). We acknowledge funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 732894 (FETPROHOT).

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Publication: Multiphonon transitions in a quantum electromechanical system - https://arxiv.org/abs/2108.06241. In the process of submitting to journals for publication.

Presenters

  • Wayne Crump

    • Aalto University

Authors

  • Wayne Crump

    • Aalto University

  • Mika A Sillanpaa

    • Aalto University

  • Alpo Välimaa

    • Aalto University

  • Mikael Kervinen

    • Chalmers Univ of Tech