Robust Strong-Coupling Architecture in Circuit Quantum Electrodynamics

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Abstract

We report on a robust method to achieve strong coupling between a superconducting flux qubit and a high-quality quarter-wavelength coplanar waveguide resonator. We demonstrate the progression from the strong to ultrastrong coupling regime by varying the length of a shared inductive coupling element, ultimately achieving a qubit-resonator coupling strength of 655 MHz, 10% of the resonator frequency. We derive an analytical expression for the coupling strength in terms of circuit parameters and also discuss the maximum achievable coupling within this framework. We experimentally characterize flux qubits coupled to superconducting resonators using one- and two-tone spectroscopy methods, demonstrating excellent agreement with the proposed theoretical model.

Original languageEnglish
Article number044045
Number of pages11
JournalPhysical Review Applied
Volume16
Issue number4
DOIs
Publication statusPublished - 25 Oct 2021
MoE publication typeA1 Journal article-refereed

Funding

This work is financially supported through Academy of Finland Grants No. 297240, No. 312057, and No. 303677 and from the European Union’s Horizon 2020 research and innovation programme under the European Research Council (ERC) programme (Grant No. 742559) and Marie Sklodowska-Curie actions (Grant Agreements 766025). We also thank the Russian Science Foundation (Grant No. 20-62-46026) for supporting the work. We sincerely acknowledge the provision of facilities by Micronova Nanofabrication Centre and OtaNano—Low Temperature Laboratory of Aalto University to perform this research and VTT Technical Research Center for sputtered films. Academy of Finland European Research Council Marie Sklodowska-Curie actions Russian Science Foundation

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  • OtaNano

    Rissanen, A. (Manager)

    Aalto University

    Facility/equipment: Facility

  • OtaNano – Low Temperature Laboratory

    Savin, A. (Manager) & Rissanen, A. (Other)

    OtaNano

    Facility/equipment: Facility

  • OtaNano - Nanofab

    Repo, P. (Manager) & Rissanen, A. (Other)

    OtaNano

    Facility/equipment: Facility

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