Reducing Quasiparticle-Induced Dissipation Using Gap-Engineering

ORAL

Abstract

Superconducting qubits based on Josephson junctions are a leading platform to implement universal quantum computing. However, non-equilibrium quasiparticles present challenges to scaling superconducting qubits because they can both degrade qubit lifetimes and generate correlated errors that compromise quantum error correction. To date, most approaches have focused on mitigating the generation of non-equilibrium quasiparticles, via shielding and filtering. In this talk, I will discuss a complementary approach that uses gap-engineering to mitigate the impact of non-equilibrium quasiparticle on chip. In particular, I will discuss progress toward the fabrication and measurement of transmon qubits with Josephson junctions that have spatially varying superconducting gap profiles in the leads.

*This research was supported by an appointment to the Intelligence Community Postdoctoral Research Fellowship Program at NIST, Boulder, Colorado administered by Oak Ridge Institute for Science and Education (ORISE) through an interagency agreement between the U.S. Department of Energy and the Office of the Director of National Intelligence (ODNI).

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Presenters

  • Stephen T Gill

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology

Authors

  • Stephen T Gill

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology

  • Akash V Dixit

    • National Institute of Standards and Technology, Boulder

  • Trevyn Larson

    • National Institute of Standards and Technology, Boulder

  • Zachary L Parrott

    • National Institute of Standards and Technology, Boulder

  • Anthony McFadden

    • National Institute of Standards and Technology, Boulder
    • University of California, Santa Barbara
    • National Institute of Standards and Technology

  • Katarina Cicak

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology

  • Raymond W Simmonds

    • National Institute of Standards and Technology, Boulder

  • John D Teufel

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology Boulder

  • José Aumentado

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • Quantum Circuits, Inc
    • Quantum Circuits, Inc.

  • Florent Lecocq

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology