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.
@article{arxiv.2209.07551,
title = {Three-wave mixing traveling-wave parametric amplifier with periodic variation of the circuit parameters},
author = {Anita Fadavi Roudsari and Daryoush Shiri and Hampus Renberg Nilsson and Giovanna Tancredi and Amr Osman and Ida-Maria Svensson and Marina Kudra and Marcus Rommel and Jonas Bylander and Vitaly Shumeiko and Per Delsing},
journal= {arXiv preprint arXiv:2209.07551},
year = {2023}
}