APS Logo

Strategies for superconducting transmon qubits with millisecond T1 relaxation time

ORAL

Abstract

Significant strides have been made in extending qubit lifetimes by mitigating lossy materials at various surfaces and interfaces of superconducting transmon qubits. We have recently demonstrated a five-fold improvement of T1 energy relaxation time by encapsulating the Nb surface to prevent native oxide formation. To further extend qubit coherence to millisecond timescales and beyond, we are actively exploring novel strategies. Such strategies include substrate preparation, alternative materials as low loss platforms, novel non-oxide forming low loss capping layers, optimized qubit designs & qubit packaging, and optimized Josephson junction materials, processing, and design. Qubit relaxation time T1 measurements will be reported with best T1’s in excess of a millisecond.

–

Publication: Bal, M., Murthy, A.A., Zhu, S. et al. Systematic improvements in transmon qubit coherence enabled by niobium surface encapsulation. npj Quantum Inf 10, 43 (2024).

Presenters

  • Mustafa Bal

    Fermi National Accelerator Laboratory (Fermilab), Fermi National Accelerator Laboratory

Authors

  • Mustafa Bal

    Fermi National Accelerator Laboratory (Fermilab), Fermi National Accelerator Laboratory

  • Akshay Murthy

    Fermi National Accelerator Laboratory, Fermi National Accelerator Laboratory (Fermilab), Fermilab

  • Francesco Crisa

    Fermi National Accelerator Laboratory, Fermilab, Fermilab, SQMS, Fermi National Accelerator Laboratory (Fermilab)

  • Sabrina Garattoni

    Fermilab, Fermi National Accelerator Laboratory (Fermilab), Fermi National Accelerator Laboratory

  • Shaojiang Zhu

    Fermi National Accelerator Laboratory (Fermilab), Fermilab, Fermi National Accelerator Laboratory

  • Daniel Bafia

    Fermi National Accelerator Laboratory (Fermilab), Fermilab, Fermi National Accelerator Laboratory

  • Jasmine Panthee

    Northwestern University

  • Zuhawn Sung

    Fermi National Accelerator Laboratory (FNAL), Fermi National Accelerator Laboratory

  • Jaeyel Lee

    Fermilab, Fermi National Accelerator Laboratory

  • David V Zanten

    Fermi National Accelerator Laboratory (Fermilab), Fermilab, Fermi National Accelerator Laboratory

  • Ivan Nekrashevich

    Fermi National Accelerator Laboratory (Fermilab), Fermi National Accelerator Laboratory

  • Andrei Lunin

    Fermi National Accelerator Laboratory

  • Alexander Romanenko

    Fermi National Accelerator Laboratory, Fermi National Accelerator Laboratory (Fermilab), Fermilab

  • Anna Grassellino

    Fermi National Accelerator Laboratory, Fermi National Accelerator Laboratory (Fermilab), Fermilab