Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 18: Poster II
QI 18.28: Poster
Mittwoch, 20. März 2024, 11:00–14:30, Poster A
High-Coherence Fluxonium Qubits Using Dolan Bridge Junction Arrays — •Vincent Koch1,2, Johannes Schirk1,2, Florian Wallner1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Ivan Tsitsilin1,2, Niklas Glaser1,2, Longxiang Huang1,2, Klaus Liegener1,2, Christian Schneider1,2, and Stefan Filipp1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany
Fluxonium qubits have experienced increasing interest in recent years as they exhibit large anharmonicity and high coherence times without sacrificing controlability, which makes them a very well-suited platform for high-fidelity super-conducting quantum computation. In the pursuit of designing and fabricating high coherence fluxonium qubits we investigate the implementation of Josephson junction arrays using different fabrication techniques to improve on junction density and yield. We start by examining the limits posed on the bridge dimensions by fabricating test structures and performing DC and AC measurements to determine yield and fidelity. Afterwards, we integrate the junction arrays into single fluxonium qubit designs and measure the coherence time. Additionally, we discuss and simulate the dominating loss channels of fluxoniums, such as dielectric and quasiparticle losses.
Keywords: Fluxonium; Qubit Design