Nanowire Superinductance Fluxonium Qubit

ORAL

Abstract

We characterize a fluxonium qubit consisting of a Josephson junction inductively shunted with a NbTiN nanowire superinductance. We explain the measured energy spectrum by means of a multimode theory accounting for the distributed nature of the superinductance and the effect of the circuit nonlinearity to all orders in the Josephson potential. Using multiphoton Raman spectroscopy, we address multiple fluxonium transitions, observe multilevel Autler-Townes splitting and measure an excited state lifetime of T1 = 20 μs. By measuring T1 at different magnetic flux values, we find a crossover in the lifetime limiting mechanism from capacitive to inductive losses.

*Army Research Office Grant No. W911NF-15-1-0421 and the Princeton Center for Complex Materials DMR-142052

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Presenters

  • Thomas Hazard

    • Princeton University
    • Department of Electrical Engineering, Princeton University
    • Electrical Engineering, Princeton University

Authors

  • Thomas Hazard

    • Princeton University
    • Department of Electrical Engineering, Princeton University
    • Electrical Engineering, Princeton University

  • Andras Gyenis

    • Princeton University
    • Department of Electrical Engineering, Princeton University
    • Electrical Engineering, Princeton University

  • Agustin Di Paolo

    • Institut Quantique and Département de Physique, Université de Sherbrooke
    • Universite de Sherbrooke
    • Institut Quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1

  • Abraham Asfaw

    • Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
    • Electrical Engineering, Princeton University

  • Alexandre Blais

    • Institut Quantique and Département de Physique, Université de Sherbrooke
    • Université de Sherbrooke
    • Universite de Sherbrooke
    • Université de Sherbrooke, Institut quantique and Département de Physique
    • Univ. of Sherbrooke
    • Institut Quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1

  • Stephen Aplin Lyon

    • Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
    • Princeton University
    • Electrical Engineering, Princeton University

  • Andrew Houck

    • Princeton University
    • Department of Electrical Engineering, Princeton University
    • Electrical Engineering, Princeton University