SKM 2023 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 39: Superconducting Electronics

TT 39.6: Talk

Wednesday, March 29, 2023, 16:45–17:00, HSZ 304

Parameter spread in Josephson traveling-wave parametric amplifiers: Vulnerabilities and tolerances — •Christoph Kissling, Victor Gaydamachenko, Fabian Kaap, Marat Khabipov, Ralf Dolata, Alexander B. Zorin, and Lukas Grünhaupt — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Josephson traveling-wave parametric amplifiers (JTWPAs) hold great promise for wideband amplification of few-photon-level signals at microwave frequencies. These devices typically consist of thousands of nominally identical circuit elements, which are subject to fabrication variations. We analyse the effect of circuit parameter variation on the performance of a JTWPA using transient circuit simulations. Using this tool, we analyze two dispersion engineering concepts, resonant phase matching and periodic capacitance modulation, and compare their parameter spread tolerances. We identify circuit elements, which are critical concerning parameter spread, and explore ways to mitigate the impact of spread. Furthermore, we present the status of our practical implementation of rf-SQUID based JTWPAs and show experimental results.