The Most Coherent Superconducting Qubit?

ORAL

Abstract

We report superconducting fluxonium qubits with coherence times limited by energy relaxation and reproducibly satisfying T2 > 100 μs (T2 > 400 μs in one device). Moreover, given the state-of-the-art values of the surface loss tangent and 1/f flux noise amplitude, coherence times can be further improved beyond 1 ms. Our results violate a common viewpoint that the number of Josephson junctions in a superconducting circuit - over 102 here - must be minimized for the best qubit coherence. We outline how the combination of long coherence times and large anharmonicity unque to fluxonium can benefit both gate-based and adiabtic quantum computing.

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Presenters

  • Aaron Somoroff

    • Physics, Univ of Maryland-College Park
    • University of Maryland, College Park
    • University of Maryland - College Park

Authors

  • Aaron Somoroff

    • Physics, Univ of Maryland-College Park
    • University of Maryland, College Park
    • University of Maryland - College Park

  • Long Nguyen

    • University of Maryland, College Park

  • Yen-Hsiang Lin

    • Physics, Univ of Maryland-College Park
    • University of Maryland, College Park

  • Ray Mencia

    • Physics, Univ of Maryland-College Park
    • University of Maryland, College Park

  • Nicholas Grabon

    • University of Maryland, College Park

  • Quentin Ficheux

    • University of Maryland, College Park
    • Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique,F-69342 Lyon, France

  • Konstantin Nesterov

    • University of Wisconsin-Madison
    • University of Wisconsin - Madison

  • Maxim G Vavilov

    • University of Wisconsin-Madison
    • Department of Physics, University of Wisconsin - Madison
    • University of Wisconsin - Madison

  • Vladimir Manucharyan

    • Physics, Univ of Maryland-College Park
    • University of Maryland, College Park
    • University of Maryland - College Park
    • University of Maryland