Two Fluxonium CZ Gate using a Transmon Coupler

ORAL

Abstract

There have been increasing efforts to improve the coherence times and gate fidelities for superconducting qubits. Recently, fluxonium qubits have been gaining atention due to its large anharmonicity, millisecond coherence times, and higher gate fidelities. In this work we study two fluxoniums capacitively coupled by a flux-tunable transmon. We implement a CZ gate by selectively driving the transmon levels. Specifically, we cycle the transmon-population through non-computational states conditional on the state of the fluxoniums, thus, accumulating a conditional phase. Our circuit is designed to have optimal frequency selectivity. Using numerical simulations, we demonstrate high fidelities, low leakage, and very low residual ZZ-interaction. We will also present our first results on our experimental implementation.

*This research was co-funded by the Dutch Research Council(NWO).

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Presenters

  • Siddharth Singh

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Siddharth Singh

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Figen Yilmaz

    • Delft University of Technology
    • QU Tech
    • Delft University of Technology (TU Delft)
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Siyu Wang

    • Delft University of Technology

  • Eugene Y Huang

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Martijn F Zwanenburg

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Taryn V Stefanski

    • Delft University of Technology
    • Quantum Engineering Centre for Doctorial Training, University of Bristol and QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Christian K Andersen

    • Delft University of Technology