Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.45: Poster

Montag, 18. März 2024, 15:00–18:00, Poster C

Design and fabrication of Niobium-trilayer based Dimer Josephson Junction Array Amplifier — •Bhoomika R Bhat, Asen L Georgiev, Fabian Kaap, Victor Gaydamachenko, Christoph Kissling, Judith Felgner, Mark Bieler, and Lukas Grünhaupt — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

Quantum computation and other applications utilizing microwave signals at powers of a few fW benefit from amplification with the smallest possible noise added. Josephson parametric amplifiers are a well-established class of devices that can meet this condition. We design a Niobium-trilayer-based Dimer Josephson Junction Array Amplifier (DJJAA) [1], a standing wave parametric amplifier, which has several pairs of modes so called dimers, in the 4 to 8 GHz range. In principle, each of these dimers can be used to achieve nondegenerate amplification using the four-wave mixing mechanism. Our device, consisting of arrays with 800-1200 dc-SQUIDs is fabricated in Nb/Al-AlO_x/Nb trilayer technology. We present our design flow, which employs finite element simulations and the fabrication process.

[1] P. Winkel et al., Phys. Rev. Applied 13, 024015 (2020).

Keywords: Superconductivity; Parametric amplifiers; JPA; Niobium-trilayer fabrication; Low noise amplification