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Unimon qubit

Author

Listed:
  • Eric Hyyppä

    (IQM)

  • Suman Kundu

    (QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University)

  • Chun Fai Chan

    (IQM)

  • András Gunyhó

    (QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University)

  • Juho Hotari

    (IQM)

  • David Janzso

    (IQM)

  • Kristinn Juliusson

    (IQM)

  • Olavi Kiuru

    (QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University)

  • Janne Kotilahti

    (IQM)

  • Alessandro Landra

    (IQM)

  • Wei Liu

    (IQM)

  • Fabian Marxer

    (IQM)

  • Akseli Mäkinen

    (IQM)

  • Jean-Luc Orgiazzi

    (IQM)

  • Mario Palma

    (IQM)

  • Mykhailo Savytskyi

    (IQM)

  • Francesca Tosto

    (IQM)

  • Jani Tuorila

    (IQM)

  • Vasilii Vadimov

    (QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University)

  • Tianyi Li

    (IQM)

  • Caspar Ockeloen-Korppi

    (IQM)

  • Johannes Heinsoo

    (IQM)

  • Kuan Yen Tan

    (IQM)

  • Juha Hassel

    (IQM)

  • Mikko Möttönen

    (IQM
    QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University
    VTT Technical Research Centre of Finland Ltd. & QTF Centre of Excellence)

Abstract

Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance. Here, we introduce a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with our quantum models, we measure the qubit frequency, ω01/(2π), and increased anharmonicity α/(2π) at the optimal operation point, yielding, for example, 99.9% and 99.8% fidelity for 13 ns single-qubit gates on two qubits with (ω01, α) = (4.49 GHz, 434 MHz) × 2π and (3.55 GHz, 744 MHz) × 2π, respectively. The energy relaxation seems to be dominated by dielectric losses. Thus, improvements of the design, materials, and gate time may promote the unimon to break the 99.99% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems.

Suggested Citation

  • Eric Hyyppä & Suman Kundu & Chun Fai Chan & András Gunyhó & Juho Hotari & David Janzso & Kristinn Juliusson & Olavi Kiuru & Janne Kotilahti & Alessandro Landra & Wei Liu & Fabian Marxer & Akseli Mäkin, 2022. "Unimon qubit," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34614-w
    DOI: 10.1038/s41467-022-34614-w
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    References listed on IDEAS

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