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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.

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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