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  • Letter
  • Open Access

Broadband coplanar-waveguide-based impedance-transformed Josephson parametric amplifier

Bingcheng Qing1,*, Long B. Nguyen1,2,†, Xinyu Liu3, Hengjiang Ren3, William P. Livingston1,2,‡, Noah Goss1,2, Ahmed Hajr4, Trevor Chistolini1, Zahra Pedramrazi1,2 et al.

David I. Santiago1,2, Jie Luo3, and Irfan Siddiqi1,2

  • 1Department of Physics, University of California, Berkeley, California 94720, USA
  • 2Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Anyon Computing Inc., Emeryville, California 94662, USA
  • 4Graduate Group in Applied Science and Technology, University of California at Berkeley, Berkeley, California, 94720, USA

  • *bc.qing@berkeley.edu
  • †longbnguyen@berkeley.edu
  • ‡Present address: Google Quantum AI, Mountain View, CA 94043, USA.
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Phys. Rev. Research 6, L012035 – Published 22 February, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012035

Abstract

Quantum-limited Josephson parametric amplifiers play a pivotal role in advancing the field of circuit quantum electrodynamics by enabling the fast and high-fidelity measurement of weak microwave signals. Therefore, it is necessary to develop robust parametric amplifiers with low noise, broad bandwidth, and reduced design complexity for microwave detection. However, current broadband parametric amplifiers either have degraded noise performance or rely on complex designs. Here, we present a device based on the broadband impedance-transformed Josephson parametric amplifier that integrates a hornlike coplanar waveguide transmission line, which significantly decreases the design and fabrication complexity while keeping comparable performance. The device shows an instantaneous bandwidth of 700 (200) MHz for 15 (20) dB gain with an average input saturation power of −110 dBm and near quantum-limited added noise. The operating frequency can be tuned over 1.4 GHz using an external flux bias. We further demonstrate the negligible backaction from our device on a transmon qubit. The amplification performance and simplicity of our device promise its wide adaptation in quantum metrology, quantum communication, and quantum information processing.

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Phys. Rev. Research 6, L012035– Published 22 February, 2024
  • Received 25 October 2023
  • Accepted 8 January 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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