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<p>Superconducting travelling-wave parametric amplifiers are promising devices for the near-quantum-limited broadband amplification of microwave signals and are essential for high-quantum-efficiency microwave read-out lines. Built-in isolation, as well as gain, could address their primary limitation: a lack of true directionality due to the potential backward travel of electromagnetic radiation to their input port. Here we report a travelling-wave parametric amplifier isolator that is based on Josephson junctions. The approach uses third-order nonlinearity for amplification and second-order nonlinearity for the frequency upconversion of backward-propagating modes to provide reverse isolation. These parametric processes, enhanced by a phase-matching mechanism, exhibit gain of up to 20 dB and reverse isolation of up to 30 dB over a static 3-dB bandwidth greater than 500 MHz and maintain near-quantum-limited added noise.</p>

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A travelling-wave parametric amplifier isolator

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Arpit Ranadive,
  • Bekim Fazliji,
  • Gwenael Le Gal,
  • Giulio Cappelli,
  • Guilliam Butseraen,
  • Edgar Bonet,
  • Eric Eyraud,
  • Sina Böhling,
  • Luca Planat,
  • A. Metelmann,
  • Nicolas Roch

摘要

Superconducting travelling-wave parametric amplifiers are promising devices for the near-quantum-limited broadband amplification of microwave signals and are essential for high-quantum-efficiency microwave read-out lines. Built-in isolation, as well as gain, could address their primary limitation: a lack of true directionality due to the potential backward travel of electromagnetic radiation to their input port. Here we report a travelling-wave parametric amplifier isolator that is based on Josephson junctions. The approach uses third-order nonlinearity for amplification and second-order nonlinearity for the frequency upconversion of backward-propagating modes to provide reverse isolation. These parametric processes, enhanced by a phase-matching mechanism, exhibit gain of up to 20 dB and reverse isolation of up to 30 dB over a static 3-dB bandwidth greater than 500 MHz and maintain near-quantum-limited added noise.