High-Efficiency, Low-Loss Floquet-mode Traveling Wave Parametric Amplifier Characterization and Measurement

  1. Jennifer Wang,
  2. Kaidong Peng,
  3. Gregory D Cunningham,
  4. Andres Lombo,
  5. Alec Yen,
  6. Daniela Zaidenberg,
  7. William D. Oliver,
  8. and Kevin P. O'Brien
Advancing error-corrected quantum computing and fundamental science necessitates quantum-limited amplifiers with near-ideal quantum efficiency and multiplexing capability. However, existing solutions achieve one at the expense of the other. In this work, we experimentally demonstrate the first Floquet-mode traveling-wave parametric amplifier (Floquet TWPA). Fabricated in a superconducting-qubit process, our Floquet TWPA achieves minimal dissipation, quantum-limited noise performance, and broadband operation. Our device exhibits >20-dB amplification over a 3-GHz instantaneous bandwidth, <0.5-dB average in-band insertion loss, and the highest-reported intrinsic quantum efficiency for a TWPA of 92.1±7.6%, relative to an ideal phase-preserving amplifier. When measuring a superconducting qubit, our Floquet TWPA enables a system measurement efficiency of 65.1±5.8%, the highest-reported in a superconducting qubit readout experiment utilizing phase-preserving amplifiers to the best of our knowledge. These general-purpose Floquet TWPAs are suitable for fast, high-fidelity multiplexed readout in large-scale quantum systems and future monolithic integration with quantum processors.
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