Multiphonon Transitions in a Quantum Electromechanical System

Alpo Välimaa, Wayne Crump, Mikael Kervinen, Mika A. Sillanpää*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
115 Downloads (Pure)


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.

Original languageEnglish
Article number064003
Pages (from-to)1-10
Number of pages10
JournalPhysical Review Applied
Issue number6
Publication statusPublished - Jun 2022
MoE publication typeA1 Journal article-refereed


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