Simulation of magnetic field and current density profile for flux-tunable superconducting qubit devices

ORAL

Abstract

We adopt a finite-element method [1] to solve the Maxwell-London equations to simulate magnetic field and current distributions in superconducting qubit devices. Taking into account both externally applied magnetic fields and supercurrents allows us to compute the total magnetic flux through any circuit loop. This is relevant, in particular, for flux-tunable qubits where the field generated by a flux-bias line current or external electromagnet tunes the qubit frequency. Our simulation may help inform the layout design for flux-tunable qubit devices, and mitigate flux crosstalk in large-scale superconducting circuits [2].

[1] Via et al. J. Appl. Phys., 113, 093905 (2013)

[2] Dai et al. PRX Quantum, 2, 040313 (2021)

*This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DESC0012704.

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Presenters

  • Tianpu Zhao

    • Northwestern University

Authors

  • Tianpu Zhao

    • Northwestern University

  • Xinyuan You

    • Fermilab

  • Shashwat Kumar

    • Princeton University

  • Xanthe Croot

    • Princeton University

  • Andrew A Houck

    • Princeton University

  • Jens Koch

    • Northwestern University