A Josephson parametric amplifier (JPA) is executed in a three-dimensional (3D) microwave cavity by coupling it to a superconducting quantum interference device (SQUID) that is embedded in a two-dimensional resonator. The JPA is activated in a three-wave mixing configuration by injecting ac magnetic flux, at twice the 3D cavity frequency, into the SQUID. An 8.3 GHz cavity is measured in a non-degenerate phase-insensitive configuration which yields gains in excess of 40 dB, where a 20 dB gain results in an operational bandwidth of 0.4 MHz, a 1 dB compression point of -115 dBm with half a quantum of added noise.
@article{arxiv.2205.13101,
title = {A three-dimensional Josephson parametric amplifier},
author = {I. Mahboob and H. Toida and K. Kakuyanagi and Y. Nakamura and S. Saito},
journal= {arXiv preprint arXiv:2205.13101},
year = {2022}
}