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Using a Traveling-Wave Parametric Amplifier and Converter for Qubit Readout

ORAL

Abstract

Recently, our traveling wave parametric amplifier and converter (TWPAC) has been shown to produce wideband amplification concurrently with reverse isolation [1]. This new paradigm for amplifiers holds the promise of potentially eliminating the bulky and lossy microwave circulators and isolators conventionally placed between the qubits and the first amplifier, which degrade the noise performance and inhibit the scalability of superconducting quantum computers. At its core, the TWPAC relies on the addition of a parametric frequency conversion process, counter-propagating in the device with respect to the parametric amplification process. Effectively, the frequency conversion swaps any back-propagating noise with a bath coming from another frequency band. Therefore, this bath must be as close to microwave vacuum as possible to avoid populating the qubit readout cavity and dephasing the qubit. State-of-the-art qubits are sensitive to <1e-3 excess cavity photons, and maintaining such low bath occupancy can be challenging when using standard TWPAs, which permit numerous wideband spurious gain processes. In this talk I will explore ways to fully cancel spurious amplification processes using a new approach leveraging filter design principles.

[1] Malnou et al. arXiv, 2406.19476

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Publication: Malnou et al. arXiv, 2406.19476

Presenters

  • Maxime Malnou

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

Authors

  • Maxime Malnou

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

  • Connor Denney

    Colorado School of Mines, National Institute of Standards and Technology, Colorado School of Mines, NIST

  • 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

  • Katarina Cicak

    National Institute of Standards and Technology (NIST), National Institute of Standards and Technology, National Institute of Standards and Technology Boulder

  • Kristen L Genter

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

  • John D Teufel

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

  • 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.

  • 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