Fabrication optimizations yield Josephson parametric converters and amplifiers with internal quality factors exceeding 100,000 at the single-photon level, a record for tunable Josephson circuits.
In particular, a potential displacement of the ideal resonance circle due to a Fano interference may persist [42, 60]
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Fabrication of low-loss Josephson parametric devices
Fabrication optimizations yield Josephson parametric converters and amplifiers with internal quality factors exceeding 100,000 at the single-photon level, a record for tunable Josephson circuits.