Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I

TT 38.2: Vortrag

Mittwoch, 19. März 2025, 17:00–17:15, H32

Niobium-trilayer based Dimer Josephson Junction Array Amplifiers — •Bhoomika R Bhat, Asen L Georgiev, Fabian Kaap, Victor Gaydamachenko, Christoph Kissling, Judith Felgner, Mark Bieler, and Lukas Grünhaupt — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Qubit readout and other quantum technologies using microwave signals at low powers of a few fW benefit from amplification with the least possible added noise. Josephson parametric amplifiers are a well-established class of devices meeting this condition. We design a Dimer Josephson Junction Array Amplifier (DJJAA) [1], which has several pairs of modes, so-called dimers, in the 4 GHz to 12 GHz range. In principle, each of these dimers can be used to achieve non-degenerate amplification using the four-wave mixing regime. Our devices, consisting of arrays with 600-1200 dc-SQUIDs, are fabricated in Nb/Al-AlOx/Nb trilayer technology. We present finite element simulations of our design as well as the fabrication process and the first experimental results of our devices.

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

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