Novel two-qubit gates for the light fluxonium qubit

ORAL

Abstract

The fluxonium qubit, taken in the light regime where phase-slip rate/energy is of the order of the inductive energy, presents a low-energy spectrum with reduced flux dispersion. With flux noise amplitude being weaker than that of charge noise, the light fluxonium qubit should benefit from a high coherence time without having to pay the price of a lower anharmonicity as it is the case of the transmon. Here, we introduce a two-qubit gate for the light fluxonium in a parameter regime where the coherence times are predicted to be long and that is within the reach of current circuit-QED technology. Our proposal exploits an analogy between flux- and charge-noise insensitive circuit modes [Pechenezhskiy et al., Nature 585, 368–371 (2020)] alongside lessons learned from the transmon qubit.

*This work was undertaken thanks in part to funding from NSERC, the Canada First Research Excellence Fund and the ARO grant No. W911NF-18-1-0411

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Presenters

  • Joachim Cohen

    • Université de Sherbrook
    • Universite de Sherbrooke

Authors

  • Joachim Cohen

    • Université de Sherbrook
    • Universite de Sherbrooke

  • Agustin Di Paolo

    • Physics, Universite de Sherbrooke
    • Universite de Sherbrooke
    • Institut quantique and Departement de physique, Universite de Sherbrooke
    • Institut Quantique and Department de Physique, Universite de Sherbrooke
    • Institut quantique and Departement de Physique, Universite de Sherbrooke

  • Larry Chen

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ of California – Berkeley

  • Trevor Chistolini

    • Physics, University of California, Berkeley
    • Univ of California - Berkeley

  • John Mark Kreikebaum

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley

  • Long B Nguyen

    • University of Maryland, College Park
    • Physics, University of California, Berkeley
    • University of Maryland

  • Ravi K. Naik

    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley
    • University of California Berkeley
    • Univ of California - Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley
    • University of California - Berkeley

  • David Ivan Santiago

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Lawrence Berkely National Laboratory
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Irfan Siddiqi

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California - Berkeley
    • Univ of California – Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • Physics, University of California, Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Alexandre Blais

    • Universite de Sherbrooke
    • Institut Quantique and Département de Physique, Université de Sherbrooke
    • Physics, Universite de Sherbrooke
    • Université de Sherbrook
    • Université de Sherbrooke
    • Département de Physique, Université de Sherbrooke
    • Institut quantique & Departement de Physique, Universite de Sherbrooke
    • Institut quantique and Departement de physique, Universite de Sherbrooke
    • Institut Quantique and Department de Physique, Universite de Sherbrooke
    • Institut quantique and Departement de Physique, Universite de Sherbrooke