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Arbitrary controlled-phase gate on fluxonium qubits

ORAL

Abstract

Recent achievements in quantum computing underlined the need of continuous families of two-qubit gates specially tailored for certain class of algorithms currently used on Noisy Intermediate Scale Quantum (NISQ) processors. In this work, we demonstrate the implementation of a continuous set of microwave-activated arbitrary controlled-phase (CPhase) gates on two fluxonium qubits, a promising candidate for quantum computation. We realized fast (110 ns) and precise (99.1% fidelity) CPhase gates by driving off-resonantly higher transitions. We assess the quality of our gates by performing quantum process tomography, interleaved randomized benchmarking and cross-entropy benchmarking. Additionally, we demonstrate that this technique can be used to cancel static ZZ interaction to mitigate quantum cross-talks between qubits. Unlike the equivalent gate on the transmon qubit, our scheme does not require any auxiliary degree of freedom nor parameter matching relieving the burden to scaling this approach to larger systems. We conclude the dominant error source is due to incoherent processes that could be mitigated to reduce errors in the 10^-3 range.

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Presenters

  • Haonan Xiong

    University of Maryland, College Park

Authors

  • Haonan Xiong

    University of Maryland, College Park

  • 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

  • Konstantin Nesterov

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

  • Long B Nguyen

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

  • Aaron Somoroff

    University of Maryland, College Park, University of Maryland

  • Chen Wang

    University of Massachusetts Amherst, University of Massachusetts - Amherst, Physics, University of Massachusetts Amherst

  • 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