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TT: Fachverband Tiefe Temperaturen
TT 28: Superconducting Electronics: SQUIDs and other Josephson Circuits and Components
TT 28.7: Vortrag
Dienstag, 10. März 2026, 11:15–11:30, CHE/0089
Controlling three- and four-wave mixing processes in JTWPAs — •Daniil Bazulin1,2, Johannes Schirk1,2, Niklas Bruckmoser1,2, Leon Koch3, Yongjie Yuan4, Michael Haider4,5, Stefan Filipp1,2,6, and Kirill G. Fedorov1,2,6 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 3Peak Quantum GmbH, 85748 Garching, Germany — 4TUM School of Computation Information and Technology, Technical University of Munich, 85748 Garching, Germany — 5Universität der Bundeswehr München, 85579 Neubiberg, Germany — 6Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Josephson travelling-wave parametric amplifiers (JTWPAs) are essential for scalable quantum computing with superconducting circuits. Their typical bandwidths of several gigahertz, in combination with quantum-limited noise performance, enable high-fidelity multiplexed readout of qubits. In JTWPAs, amplification occurs due to the interaction between the pump and signal modes in a nonlinear medium provided by superconducting nonlinear asymmetric inductive elements (SNAILs). Here, we experimentally investigate a robust JTWPA design based on SNAILs that is capable of operating in both three- and four-wave-mixing regimes. Our results show that we can fully suppress the three-wave mixing process while observing over 10 dB gain from the four-wave pumping over the bandwidth of 4 GHz.
Keywords: JTWPA; SNAIL; mixing processes; nonlinearity