Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Superconducting Electronics: Qubits I (joint session TT/QI)
TT 47.10: Vortrag
Mittwoch, 20. März 2024, 17:15–17:30, H 0104
Phase-flux symmetries in three-wave mixing Josephson travelling wave parametric amplifiers — •Daniil E. Bazulin1,2, Kedar E. Honasoge1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Thomas Luschmann1,2, Achim Marx2, Stefan Filipp1,2,3, and Kirill G. Fedorov1,2,3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Enabling the three-wave mixing process in Josephson Travelling Wave Parametric Amplifiers (JTWPAs) requires inversion symmetry breaking of an effective potential. This task can be achieved in various ways by exploiting either flux- or phase-bias regimes. Moreover, common JTWPA coupling schemes additionally introduces two distinct possibilities of flux or phase pumping. As the result, we identify four interrelated bias and pump schemes, which we theoretically and experimentally analyze in our samples based on Superconducting Nonlinear Asymmetric Inductive Elements (SNAILs). We show that the nonlinear behavior of such a JTWPA strongly depends on the chosen bias-pumping scheme, unraveling novel experimental control schemes for optimal JTWPA performance.
Keywords: JTWPA; SNAIL; qubit readout