Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.32: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Characterization of Nb Air Bridges for Superconducting Quantum Computing — •Amanda Scoles1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Ivan Tsitsilin1,2, David Bunch1,2, Julius Feigl1,2, Lea Richard1,2, Vera Bader1,2, Lasse Södergren1,2, Christian Schneider1,2, and Stefan Filipp1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany
Superconducting qubits are a promising platform for the realization of practical quantum computing. The short gate times, comparatively long lifetimes, and relatively straightforward fabrication process, when compared to other systems, indicate an encouraging future for superconducting quantum circuits. Nevertheless, further optimization of both the fabrication and calibration processes is necessary to fully realize the potential of this platform. In particular, there is a need to enhance qubit coherence, reliability and scalability, which are the current main limitations of this technology.
In this work we investigate Nb air bridges, which provide flexibility in routing of control lines and facilitate the scaling of qubit numbers in planar geometries. We investigate the optimal fabrication parameters in order to maximize the yield of such structures. Additionally, we assess the quality factors of superconducting resonators in the vicinity of air bridges as well as daisy chains of air bridges, to determine the additional loss induced by the air bridge process.
Keywords: Fabrication; Air bridges; Quality factor; Resonators