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Experimental study of flux noise in nanowire transmons subject to an applied magnetic field

ORAL

Abstract

Flux noise is generally the dominant dephasing mechanism in transmon qubits using SQUID loops as a tunable inductive element. Continuing experimental research ambitions to elucidate the microscopic origin and mitigation of flux noise. In this work, we experimentally investigate flux noise using an unconventional knob for circuit QED: an applied magnetic field. We first present various changes introduced to our circuit QED system to further extend the field compatibility of resonators and nanowire transmons beyond 70 mT. Next, we use standard coherence measurements and sensitivity analysis on and off flux sweetspots to investigate the dependence of flux noise on field applied along the axis of the two constituent nanowire junctions.

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Presenters

  • Thijs Stavenga

    Delft University of Technology

Authors

  • Thijs Stavenga

    Delft University of Technology

  • Florian Luthi

    Intel Corporation

  • Elmore Vaal

    Delft University of Technology

  • Oluwatumininu Aluko

    Delft University of Technology

  • Peter Krogstrup

    Niels Bohr Institute, University of Copenhagen, University of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Leonardo DiCarlo

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology - Netherlands, QuTech and Kavli Institute of Nanoscience, Delft University of Technology