Three-wave mixing traveling-wave parametric amplifier with periodic variation of the circuit parameters

  1. Anita Fadavi Roudsari,
  2. Daryoush Shiri,
  3. Hampus Renberg Nilsson,
  4. Giovanna Tancredi,
  5. Amr Osman,
  6. Ida-Maria Svensson,
  7. Marina Kudra,
  8. Marcus Rommel,
  9. Jonas Bylander,
  10. Vitaly Shumeiko,
  11. and Per Delsing
We report the implementation of a near-quantum-limited, traveling-wave parametric amplifier that uses three-wave mixing (3WM). To favor amplification by 3WM, we use the superconducting nonlinear asymmetric inductive element (SNAIL) loops, biased with a dc magnetic flux. In addition, we equip the device with dispersion engineering features to create a stop-band at the second harmonic of the pump and suppress the propagation of the higher harmonics that otherwise degrade the amplification. With a chain of 440 SNAILs, the amplifier provides up to 20 dB gain and a 3-dB bandwidth of 1 GHz. The added noise by the amplifier is found to be less than one photon.

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