A SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.
To take losses in the waveguide between the quantum system and this mirror into account, we also insert a beam splitter with transmissionη 0 for both propagation directions
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High-gain and large-bandwidth Josephson parametric amplifier influenced by Fabry-P\'erot interference
A SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.