Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.37: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Design of granular aluminum based kinetic inductance traveling wave parametric amplifiers — Daniel Valenzuela, Christoph Kissling, •Victor Gaydamachenko, Fabian Kaap, Sergey Lotkhov, and Lukas Grünhaupt — Physikalisch-Technische Bundensanstalt, Bundesallee 100, 38116 Braunschweig

Superconducting traveling wave parametric amplifiers (TWPA) are a key ingredient in readout chains, which benefit greatly from lowest possible added noise and several GHz of bandwidth. In the case of kinetic inductance based TWPAs (KI-TWPA), the non-linear kinetic inductance of disordered superconducting thin films is used to enable three- and four-wave mixing processes for signal amplification. A key challenge for the design of KI-TWPAs is to ensure an impedance of 50 Ohm. In addition, unwanted frequency conversion processes have to be phase mismatched, while those generating amplification need to be retained. We tackle both challenges using so-called artificial coplanar waveguides with a multiperiodic capacitance variation. Here, we discuss the design of granular aluminum (grAl) KI-TWPA, our fabrication and process, and show initial experimental results.

Keywords: Parametric amplifiers; Kinetic inductance; Four wave mixing; Three wave mixing; frequency conversion