Demonstration of a Quantum Noise Limited Traveling-Wave Parametric Amplifier

  1. Nikita Klimovich,
  2. Peter Day,
  3. Shibo Shu,
  4. Byeong Ho Eom,
  5. Jenry Leduc,
  6. and Andrew Beyer
Recent progress in quantum computing and the development of novel detector technologies for astrophysics is driving the need for high-gain, broadband, and quantum-limited amplifiers. We present a purely traveling-wave parametric amplifier (TWPA) using an inverted NbTiN microstrip and amorphous Silicon dielectric. Through dispersion engineering, we are able to obtain 50 Ω impedance matching and suppress undesired parametric processes while phase matching the three-wave-mixing amplification across a large range of frequencies. The result is a broadband amplifier operating with 20 dB gain and quantum-limited noise performance at 20 mK. At the single frequency where the amplifier is phase sensitive, we further demonstrate 8 dB of vacuum noise squeezing.
arxiv pdf

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