SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Quantum Coherence and Quantum Information Systems I
TT 49.5: Vortrag
Donnerstag, 30. März 2023, 12:30–12:45, HSZ 304
Improving Fabrication Methods for Highly Coherent Superconducting Qubits — •Niklas Bruckmoser1,2,3, Leon Koch1,2,3, David Bunch1,2,3, Tammo Sievers1,2,3, Kedar E. Honasoge1,2,3, Thomas Luschmann1,2,3, and Stefan Filipp1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Superconducting qubits and resonators with long coherence times pave the way towards useful quantum processors. Significant improvements in coherence time have already been made over the last years. However, the fidelity is still limited by decoherence due to noise and losses arising in the local environment of the qubit. It is thus an integral endeavor of fabrication efforts to mitigate these effects. Here, we demonstrate that qubit lifetimes well beyond 0.1 ms can be achieved by a combination of substrate cleaning, etching optimization and post-process sample cleaning. By improving on these processes we reach quality factors above 4×106 for thin-film niobium coplanar waveguide resonators in the single photon regime and qubit lifetimes of more than 0.2 ms for niobium based transmons.