Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.36: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Experimental characterization of a wideband Josephson traveling-wave parametric amplifier — •Christoph Kissling, Marat Khabipov, Ralf Dolata, and Alexander B. Zorin — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

A Josephson traveling-wave parametric amplifier was developed and experimentally characterized. The amplifier consists of an array of N=1000-1500 RF-SQUIDs embedded in a coplanar transmission line. With a magnetic field bias, an optimal operation point ensuring a large quadratic and zero cubic nonlinearity in the current-phase relation of the SQUID can be set. Thus, the amplifier operates in a three-wave mixing regime, featuring large separation of pump and signal frequency, high bandwidth at a decent gain, and promisingly quantum-limited noise. The amplifier was realized in Niobium tri-layer technology with different circuit designs. The experimental results will be presented.