Design and Fabrication of Broadband Parametric Amplifiers for Quantum Applications

ORAL

Abstract

Josephson parametric amplifiers (JPAs) provide a straightforward means for the quantum-limited amplification of signals, with noise approaching 1/2-photon for phase-independent gain [1]. These are an important resource for the single-shot readout of superconducting qubits, allowing high fidelity measurements of single as well as multiplexed qubits. I will describe the circuit designs and fabrication process for JPAs developed at the University of Chicago, fabricated in a new nanofabrication facility. The process includes low-loss dielectric deposition, superconducting crossovers, and a Dolan-bridge based Josephson junction definition. We will present data on lumped-element JPA devices with state-of-the-art gain, saturation power, and bandwidth [2], and describe different circuit designs for achieving large bandwidths [3].

[1] R. Vijay, et al, Phys. Rev. Lett., 106, 110502, 2011
[2] J. Y. Mutus, et al, Appl. Phys. Lett. 103, 122602, 2013
[3] T. Roy, et al, Appl. Phys. Lett. 107, 262601, 2015

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Presenters

  • Joel Grebel

    University of Chicago, Institute for Molecular Engineering, University of Chicago

Authors

  • Joel Grebel

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Audrey Bienfait

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Etienne Dumur

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Hung-Shen Chang

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Ming-Han Chou

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Christopher Conner

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Gregory A Peairs

    University of Chicago, Physics, University of California, Santa Barbara, University of California, Santa Barbara, Department of Physics, University of California, Santa Barbara, Department of Physics, Univerity of California, Santa Barbara, UC Santa Barbara; University of Chicago

  • Rhys G Povey

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Kevin Satzinger

    Physics, University of California, Santa Barbara, University of California, Santa Barbara, Department of Physics, University of California, Santa Barbara, Department of Physics, Univerity of California, Santa Barbara, UC Santa Barbara; University of Chicago, Google Inc - Santa Barbara

  • Youpeng Zhong

    University of Chicago, Institute for Molecular Engineering, University of Chicago

  • Andrew N Cleland

    University of Chicago, Institute for Molecular Engineering, University of Chicago