Broadband SNAIL parametric amplifier with microstrip impedance transformer

  1. D. Ezenkova,
  2. D. Moskalev,
  3. N. Smirnov,
  4. A. Ivanov,
  5. A. Matanin,
  6. V. Polozov,
  7. V. Echeistov,
  8. E. Malevannaya,
  9. A. Samoilov,
  10. E. Zikiy,
  11. and I. Rodionov
Josephson parametric amplifiers have emerged as a promising platform for quantum information processing and squeezed quantum states generation. Travelling wave and impedance-matched parametric amplifiers provide broad bandwidth for high-fidelity single-shot readout of multiple qubit superconducting circuits. Here, we present a quantum-limited 3-wave-mixing parametric amplifier based on superconducting nonlinear asymmetric inductive elements (SNAILs), whose useful bandwidth is enhanced with an on-chip two-section impedance-matching circuit based on microstrip transmission lines. The amplifier dynamic range is increased using an array of sixty-seven SNAILs with 268 Josephson junctions, forming a nonlinear quarter-wave resonator. Operating in a current-pumped mode, we experimentally demonstrate an average gain of 17dB across 300MHz bandwidth, along with an average saturation power of −100dBm, which can go as high as −97dBm with quantum-limited noise performance. Moreover, the amplifier can be fabricated using a simple technology with just a one e-beam lithography step. Its central frequency is tuned over a several hundred megahertz, which in turn broadens the effective operational bandwidth to around 1.5GHz.
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