Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.35: Poster

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

Minimization of Loss Channels in Superconducting Resonators — •Niklas Bruckmoser1,2, Leon Koch1,2, Leonhard Hölscher1,2, David Bunch1,2, Tammo Sievers1,2, Kedar E. Honasoge1,2, Yuki Nojiri1,2, Thomas Luschmann1,2, Kirill G. Fedorov1,2, and Stefan Filipp1,2,31Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), München, Germany

Realizing a fault-tolerant quantum computer is the goal of an ever-growing number of publicly funded and commercial research and development activities. Amongst many potential platforms, quantum computers based on superconducting quantum circuits with Josephson junctions are a promising candidate. However, the fidelity of superconducting qubits is limited by decoherence due to noise arising from various sources, in particular the local environment of the qubit. Driven by the development of partially noise-protected qubit designs, related lifetimes increased significantly from several nanoseconds to a few hundred microseconds. Nonetheless, it is crucial to gain an even better understanding of the origin of loss channels to further improve the qubit coherence by tailored design and fabrication processes. Here, we demonstrate a process for fabricating coplanar waveguide resonators and qubits based on niobium thin films sputtered on silicon substrates. We achieve qubit lifetimes up to 1503muµ s by systematically analyzing fabrication steps, such as surface treatment and thin film deposition.

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