Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.36: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Reduction of frequency spread in superconducting quantum circuits — •Tammo Sievers^{1, 2, 3}, Leon Koch^1,2,3, Niklas Bruckmoser^{1, 2, 3}, Yuki Nojiri^{1, 2, 3}, Thomas Luschmann^1,2,3, Kedar E. Honasoge^1,2,3, Kirill G. Fedorov^1,2,3, and Stefan Filipp^1,2,3 — ¹Physik- Department, Technische Universität München, 85748 Garching, Germany — ²Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ³Munich Center for Quantum Science and Technology (MCQST)

Superconducting quantum circuits form the basis of emerging applications in quantum computing and other quantum technologies. A prominent example is the transmon qubit, a superconducting Josephson junction shunted with a large capacitance. As quantum processors scale to larger sizes, avoiding frequency collisions becomes a formidable task. Here, we present our results on different fabrication methods to reduce frequency variations of Manhattan-style Al-AlOx-Al Josephson junctions. To compare the influence of the investigated fabrication techniques, we measure the room temperature resistivity of Josephson junctions and use the Ambegaokar-Baratoff relation in order to quantify the critical current spread of the fabricated junctions.