Millimeter waves for microwave qubits

ORAL

Abstract

Millimeter waves are emerging as a key enabling technology for enhancing and connecting disparate quantum systems such as Rydberg atoms, optomechanics and superconducting qubits. Here we implement a cQED architecture using millimeter wave cavities and conventional microwave qubits. Specifically, we demonstrate a strong dispersive coupling (χ = 2π × 1.5 MHz) between a ωr = 2π × 35 GHz Al cavity and a ωq = 2π × 3 GHz transmon qubit. Recently, it has been shown that a large detuning (ωr /ωq > 10) between the qubit and cavity allows for strong readout without unwanted resonant state transitions. In part I we present numerical simulations motivating the use of millimeter waves for qubit readout and the device design. In part II we show experimental results for qubit coherence, millimeter wave readout, and suppression of unwanted state transitions.

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Presenters

  • Dennis Chunikhin

    • University of Maryland, College Park

Authors

  • Dennis Chunikhin

    • University of Maryland, College Park

  • Akash V Dixit

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology

  • Zachary Parrott

    • University of Colorado Boulder, National Institute of Standards and Technology
    • National Institute of Standards and Technology, Boulder, Colorado 80305, USA
    • University of Colorado, Boulder
    • University of Colorado Boulder
    • University of Colorado Boulder, National Institute of Standards and Technology Boulder
    • NIST, Boulder

  • Bradley Hauer

    • University of Waterloo
    • University of Waterloo, Institute for Quantum Computing
    • University of Waterloo Department of Electrical and Computer Engineering; Institute for Quantum Computing

  • Trevyn F.Q. F Larson

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • University of Colorado
    • University of Colorado Boulder, National Institute of Standards and Technology
    • University of Colorado Boulder, National Institute of Standards and Technology Boulder

  • John D Teufel

    • National Institute of Standards and Technology, University of Colorado Boulder
    • National Institute of Standards and Technology Boulder