Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.6: Poster

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

Fabrication of low-loss Josephson parametric circuits — •Kedar E. Honasoge^1,2, Yuki Nojiri^1,2, Daniil E. Bazulin^1,2, Leon Koch^1,2, Thomas Luschmann^1,2, Niklas Bruckmoser^1,2, Maria-Teresa Handschuh¹, Florian Fesquet^1,2, Michael Renger^1,2, Fabian Kronowetter^1,2,4, Achim Marx¹, Stefan Filipp^1,2,3, Rudolf Gross^1,2,3, and Kirill G. Fedorov^1,2 — ¹Walther-Meißner-Institut, 85748 Garching, Germany — ²Physik-Department, Technische Universität München, 85748 Garching, Germany — ³Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany — ⁴Rohde & Schwarz GmbH, Munich, Germany

Interest in quantum-limited amplification based on Josephson superconducting circuits has increased drastically in the past decade due to the rapidly advancing field of quantum information processing. In this context, a key challenge lies in realizing low-loss superconducting devices by minimizing energy dissipation. We achieve this goal by employing various cleaning steps during fabrication of superconducting circuits. Respectively, we fabricate Josephson parametric amplifiers with internal quality factors in excess of 10⁴. We characterize bandwidth, gain, noise, dynamic range, and other properties of the realized devices. Based on these investigations, we derive useful criteria for development of more intricate Josephson parametric circuits, such as Josephson parametric converters.