Implementation of a multi-mode qubit in coaxial circuit QED: Part 2

ORAL

Abstract

We discuss experimental results on a multi-mode qubit operating within a coaxial circuit QED architecture. This device includes a two-mode coaxial transmon qubit with out-of-plane coupling to a coaxial LC resonator. We discuss the characterisation of devices using two-tone spectroscopy and coherence measurements. We observe a strong cross-Kerr coupling between the differential and common modes of the qubit, which results in a qutrit-like behavior. Finally, we investigate charge sensitivity in such a device, and discuss its potential as a novel probe of charge fluctuations in superconducting quantum systems.

*This work was supported by the EPSRC, Oxford Quantum Circuits Ltd, and from the European Union’s Horizon 2020 research and innovation programme under grant agreement MSCA-IF-EF-ST 832814.

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Presenters

  • James Wills

    • University of Oxford

Authors

  • James Wills

    • University of Oxford

  • Sophia Sosnina

    • University of Oxford

  • Simone D Fasciati

    • University of Oxford

  • Salha Jebari

    • University of Oxford

  • Giulio Campanaro

    • University of Oxford

  • Shuxiang Cao

    • University of Oxford

  • Peter Spring

    • University of Oxford

  • Takahiro Tsunoda

    • University of Oxford

  • Ian Yang

    • University of Oxford

  • Peter J Leek

    • University of Oxford

  • Brian Vlastakis

    • University of Oxford