Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.38: Poster

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

Advanced Josephson travelling wave parametric amplifyer analysis with non-linear circuit simulations — •Lars Aaron Anhalt^1,2,3, Daniil Bazulin^1,2, Gleb Krylov^1,2, Yongjie Yuan⁴, Diego Contreras^1,2,3, Christian Gnandt^1,2,3, Michael Haider⁴, Kirill Fedorov^1,2,5, and Stefan Filipp^1,2,5 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching — ²School of Natural Sciences, Technical University of Munich, 85748 Garching — ³Ludwig-Maximilians-Universität in Munich, 80539 Munich — ⁴TUM School of Computation, Information and Technology, Technical University of Munich, 85748 Garching — ⁵Munich Center for Quantum Science and Technology, 80799 Munich

Broadband, quantum-limited microwave amplifiers are crucial for efficient and fast readout, which enables scaling of superconducting quantum processors. Josephson travelling wave parametric amplifiers (JTWPAs) are the most common solution in the field, providing amplification via copropagation of a pump tone with a signal in a nonlinear medium composed of Josephson junctions. Unwanted conversion processes, as well as stringent requirements on the fabrication processes, still pose challenges to their successful implementation. Here, we demonstrate how circuit simulation with WRSpice can help with the interpretation of experimental measurements of particular JTWPA designs and facilitate further improvements. Our simulations prove to be applicable to a wide range of circuit designs and varying parameters, reproducing competing conversion processes that go beyond analytical results from commonly used coupled mode equations.

Keywords: Josehpson TWPAs; SNAIL; 3-Wave Mixing; Circuit Simulation; WRSpice