Low-loss fabrication platform for superconducting microwave quantum circuitry

ORAL

Abstract

As superconducting qubit processors increase in size, complexity, and coherence, so must the adjacent quantum technology used to route, filter, or amplify the microwave signals to and from the qubits. These circuits require a versatile and low loss fabrication platform that can accommodate demanding circuit complexity, flexible wiring topologies and compact lumped-element components. At NIST, we developed a “Nb-trilayer” platform with Nb-Al/AlOx-Nb Josephson junctions (JJ) and low-loss amorphous silicon (a-Si) as inter-wiring dielectric that meets these demands. We present characterization and optimization of the fabrication process and show that it enables implementation of a variety of circuits: including DC- and RF-SQUID based Josephson parametric amplifiers (JPA), compact Purcell filters for superconducting qubits, and traveling-wave parametric amplifiers (TWPA) with thousands of JJs and low attenuation per unit length. The versatility of the platform makes it suitable for a wide range of other low-loss superconducting circuits.

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Presenters

  • Katarina Cicak

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

Authors

  • Katarina Cicak

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

  • Kristen L Genter

    • National Institute of Standards and Technology, Boulder

  • Maxime Malnou

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

  • José A Estrada

    • National Institute of Standards and Technology, Boulder

  • Kaixuan Ji

    • National Institute of Standards and Technology, Boulder

  • Florent Lecocq

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

  • Raymond W Simmonds

    • National Institute of Standards and Technology, Boulder

  • John D Teufel

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

  • José Aumentado

    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • Quantum Circuits, Inc
    • Quantum Circuits, Inc.