Multiphonon Transitions in a Quantum Electromechanical System
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-06
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en
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10
1-10
1-10
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Physical Review Applied, Volume 17, issue 6
Abstract
Studies of micromechanical and acoustic modes in the quantum regime have shed light on quantum properties of massive objects. Integrating these systems into superconducting circuits shows great promise for applications as quantum memory elements, bosonic codes, or in frequency conversion. To this end, investigation of nonclassical properties of acoustic degrees of freedom is critical also for applications. Here, we investigate a strongly driven system consisting of a transmon qubit interacting with a high-overtone bulk acoustic resonator. We observe multiphonon transitions, which enable mapping the energy landscape in the coupled system. At a high driving amplitude comparable to the qubit-oscillator coupling, we observe a shift of the multiphonon spectral lines, reminiscent of Stark shift, which is explained using a simple model. Our work thus also provides insight in multiquanta transitions in other qubit-oscillator systems, not limited to acoustics or circuit quantum electrodynamics.Description
| openaire: EC/H2020/732894/EU//HOT Funding Information: We acknowledge the facilities and technical support of Otaniemi research infrastructure for Micro and Nanotechnologies (OtaNano) that is part of the European Microkelvin Platform. This work is supported by the Academy of Finland (Contracts No. 307757 and No. 312057), by the European Research Council (615755-CAVITYQPD), by the Wihuri Foundation, and by the Aalto Centre for Quantum Engineering. The work is performed as part of the Academy of Finland Centre of Excellence program (Project No. 336810). We acknowledge funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 732894 (FETPRO HOT). Publisher Copyright: © 2022 American Physical Society.
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Välimaa, A, Crump, W, Kervinen, M & Sillanpää, M A 2022, ' Multiphonon Transitions in a Quantum Electromechanical System ', Physical Review Applied, vol. 17, no. 6, 064003, pp. 1-10 . https://doi.org/10.1103/PhysRevApplied.17.064003