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High-fidelity gates on fluxonium qubits

Invited

Abstract

A promising path to reduce gate errors in transmon-based quantum processors consists in developing highly anharmonic circuits with some degree of protection from prevailing decoherence sources. At present, properly designed single fluxonium qubits can have over 1 ms coherence time via the trick of slowing down the qubit transition about tenfold or more compared to transmons. We describe recent progress in the implementation of high-fidelity single and two-qubit gates in fluxonium circuits. This includes a fast microwave-activated controlled-Z gate completed in less than 9 qubit Larmor cycles (about 60 ns) with a fidelity of 99.2%, which is on-par with the best microwave-activated gates reported on transmon qubits. Finally, we discuss the prospects of extending our two-qubit gates to large scale quantum processors.
[1] Ficheux et al. arXiv:2011.02634 (2020)
[2] Nguyen et al. Phys. Rev. X 9, 041041 (2019)
[3] Nesterov et al. Phys. Rev. A 98, 030301 (2018)

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Presenters

  • Quentin Ficheux

    University of Maryland, College Park, University of Maryland, Ecole Normale Superieure de Lyon, Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique,F-69342 Lyon,France

Authors

  • Quentin Ficheux

    University of Maryland, College Park, University of Maryland, Ecole Normale Superieure de Lyon, Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique,F-69342 Lyon,France

  • Haonan Xiong

    University of Maryland, College Park

  • Aaron Somoroff

    University of Maryland, College Park, University of Maryland

  • Long B Nguyen

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

  • Konstantin Nesterov

    University of Wisconsin-Madison, University of Wisconsin - Madison, University of Wisconsin - Madison, Madison, University of Wisconsin, Madison

  • Maxim G Vavilov

    University of Wisconsin-Madison, Department of Physics and Wisconsin Quantum Institute, University of Wisconsin - Madison, University of Wisconsin - Madison, University of Wisconsin - Madison, Madison, Department of Physics, University of Wisconsin-Madison, University of Wisconsin, Madison

  • Vladimir Manucharyan

    University of Maryland, College Park, Department of Physics, University of Maryland, University of Maryland