Modeling and testing novel quasiparticle traps on superconducting qubits via geometric gap engineering

ORAL

Abstract

Non-equilibrium quasiparticles have been identified as a major decoherence source in su-

perconducting qubits. Strategies to mitigate the quasiparticle loss are highly demanded. We

propose an improved microscopic model of quasiparticle diffusion that is not constrained to

equilibrium energies. Based on this model, we explore new qubit architectures and demon-

strate the improvement of qubit relaxation and dephasing times.

* This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Superconducting Quantum Materials and Systems Center (SQMS) under contract number DE-AC02-07CH11359.

Presenters

  • Ugur Alyanak

    Fermilab, University of Chicago

Authors

  • Ugur Alyanak

    Fermilab, University of Chicago

  • Ziwen Huang

    Fermilab

  • Wei-Ting Lin

    University of Michigan

  • Xinyuan You

    Fermilab

  • Alexander Romanenko

    Fermilab, Fermi National Accelerator Laboratory

  • Anna Grassellino

    Fermilab, Fermi National Accelerator Laboratory

  • Young-Kee Kim

    University of Chicago, APS President 2024, University of Chicago

  • Shaojiang Zhu

    Fermilab, Fermi National Accelerator Laboratory