SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster: Superconductivity II
TT 58.6: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG3
Impedance engineering of flux-pumped Josephson traveling wave parametric amplifier — •Daniil E. Bazulin1,2, Kedar E. Honasoge1,2, Leon Koch1,2, Niklas Bruckmoser1,2, Yuki Nojiri1,2, Thomas Luschmann1,2, Achim Marx1, Stefan Filipp1,2,3, and Kirill G. Fedorov1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Scalable quantum computing with superconducting qubits relies on efficient and fast readout of multiple qubits. This goal can be achieved by exploiting broadband Josephson Traveling Wave Parametric Amplifiers (JTWPAs). Here, we investigate fabrication and characterization of a specific type of the JTWPA based on aluminium Superconducting Nonlinear Asymmetric Inductive eLements (SNAILs) exploiting the 3-wave mixing down-conversion process. This approach allows for separating signal and pump paths, which is expected to enhance the overall JTWPA performance by mitigating back action amplification processes and avoiding the pump depletion. Additionally, we implement a single-layer 50 Ω impedance matching approach by exploiting fish-bone capacitors fabricated simultaneously with the Josephson junctions. This technique avoids using extra dielectric layers, which are typical sources of losses and noise in JTWPAs.