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arXiv · 1812.07621

Broadband lumped-element Josephson parametric amplifier with single-step lithography

T. Elo·T. S. Abhilash·M. R. Perelshtein·I. Lilja·E. V. Korostylev·P. J. Hakonen
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Abstract

We present a lumped-element Josephson parametric amplifier (JPA) utilizing a straightforward fabrication process involving a single electron beam lithography step followed by double-angle evaporation of aluminum and in-situ oxidation. The Josephson junctions forming the SQUID are fabricated using bridgeless shadow evaporation technique, which enables reliable fabrication of relatively large ($\sim9~\mathrm{μm^2}$) junctions. Our strongly coupled flux-pumped JPA achieves 20~dB gain with 95~MHz bandwidth around 5~GHz, while the center frequency is tunable by more than 1~GHz, with the additional possibility for rapid tuning by varying the pump frequency alone. Analytical calculations based on the input-output theory reproduce our measurement results closely.

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T. Elo, T. S. Abhilash, M. R. Perelshtein, I. Lilja, E. V. Korostylev, P. J. Hakonen. 2018-12-18. Broadband lumped-element Josephson parametric amplifier with single-step lithography. https://doi.org/10.1063/1.5086091

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