Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Transport: Quantum Coherence and Quantum Information Systems – Experiments (jointly with HL, MA)
TT 16.5: Vortrag
Montag, 16. März 2015, 16:00–16:15, H 0110
Characterization of superconducting transmission line resonators — •Jan Goetz1,2, Philipp Summer1,2, Sebastian Meier1,2, Marta Krawczyk1, Max Häberlein1,2, Alexander Baust1,2,3, Karl Friedrich Wulschner1,2, Edwar Xie1,2,3, Peter Eder1,2, Michael Fischer1,2, Manuel Schwarz1,2, Ling Zhong1,2,3, Frank Deppe1,2, Kirill Fedorov1,2, Hans Hübl1,2, Achim Marx1, Edwin Menzel1,2, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, Germany
Superconducting transmission line resonators are widely used in circuit quantum electrodynamics experiments as quantum bus or storage devices. For these applications, long coherence times, which can be linked to the internal quality factor of the resonators, are crucial. Here, we show a systematic study of the internal quality factor of niobium thin film resonators. We analyze different cleaning methods and substrate parameters for coplanar waveguide as well as microstrip geometries. In addition, we investigate the impact of a niobium-aluminum interface which is necessary for galvanically coupled flux qubits made from aluminum. This interface can be avoided by fabricating the complete resonator-qubit structure using Al/AlOx/Al technology during fabrication.
This work is supported by the DFG via SFB 631 and EU projects CCQED and PROMISCE.