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.
detuning ∆ data to the expression [41, 45] θ(∆) = θ0 + 2 arctan − 2∆ κ
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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.