Mediating interactions between superconducting microwave cavities with three-wave mixing, part 1

ORAL

Abstract

Engineering tunable bilinear couplings between microwave cavities provides a way to manipulate and entangle long-lived quantum states. Two-cavity gates, such as the beam splitter and exponential SWAP (eSWAP), have been successfully demonstrated using a driven transmon coupled to both cavities. However, the fidelity of these gates is limited by unwanted 4th order processes such as the AC Stark effect. By replacing the transmon’s Josephson junction with a superconducting nonlinear asymmetric inductive element (SNAIL), we produce a bilinear interaction via its 3rd order nonlinearity while minimizing 4th order effects. This is expected to offer high fidelity two-cavity gates using all-RF control. I will discuss experimental design considerations and the theory behind the coupled-cavity device.

*We acknolwedge support from the following sources:
National Science Foundation DMR-1609326
Army Research Office W911NF-18-1-0212
Army Research Office MURI Grant No. W911NF-16-10349
Max Planck Research Award-Alexander von Humboldt Foundation

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Presenters

  • Stijn de Graaf

    • Yale University

Authors

  • Stijn de Graaf

    • Yale University

  • Benjamin Chapman

    • Yale University

  • Yaxing Zhang

    • Yale University

  • Shantanu O Mundhada

    • Yale University
    • Department of Applied Physics, Yale University

  • Akshay Koottandavida

    • Yale University
    • Department of Applied Physics, Yale University

  • Nicholas Frattini

    • Yale University

  • Luke Burkhart

    • Yale University

  • Alexander P Read

    • Yale University

  • Luigi Frunzio

    • Yale University
    • Department of Applied Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Steven Girvin

    • Yale University
    • Department of Physics and Applied Physics, Yale University
    • Department of Physics, Yale University
    • Yale Quantum Institute, Yale University

  • Michel H. Devoret

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University

  • Robert Schoelkopf

    • Yale University
    • Department of Applied Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University