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Superconducting Qubit Readout with an Embedded Parametric Amplifier

ORAL

Abstract

Typical dispersive superconducting qubit readout relies on ferrite circulators placed between the qubit’s readout cavity and the first parametric amplifier to avoid backaction on the qubit. The microwave losses intrinsic to these circulators and their associated wiring reduce scalability, measurement fidelity, and readout efficiency. Parametric amplifiers with built-in isolation remove the need for these additional circulators and have already been used to measure superconducting qubits with record high efficiencies [1]. In this talk, we take a step toward achieving even higher efficiencies by embedding such an isolating amplifier within a 3D transmon qubit. We discuss the novel theoretical tools used to understand the qubit’s decoherence in this parametrically coupled multimode system and experimental progress in achieving a high fidelity, high efficiency, and low backaction qubit measurement.

[1] F. Lecocq, L. Ranzani, G. A. Peterson, K. Cicak, X. Y. Jin, R. W. Simmonds, J. D. Teufel, and J. Aumentado, Physical Review Letters 126 (2021).

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Presenters

  • Benton T Miller

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

Authors

  • Benton T Miller

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

  • Lindsay Orr

    Karlsruhe Institute of Technology

  • Sudhir K Sahu

    University of Massachusetts Lowell, University of Massachusetts Lowell, National Institute of Standards and Technology, National Institute of Standards and Technology, University of Massachusetts Lowell, National Institute of Standards and Technology Boulder, University of Massachusetts Lowell

  • Raymond W Simmonds

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

  • Jose Aumentado

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

  • John D Teufel

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

  • Anja Metelmann

    Karlsruhe Institute of Technology

  • Florent Lecocq

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