Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 17: Cryogenic Detectors and Cryotechnique
TT 17.5: Talk
Wednesday, September 7, 2022, 10:30–10:45, H22
Transport properties of superconducting thin films and superconducting single-photon detectors — •Fabian Wietschorke1, Stefan Strohauer2, Rasmus Flaschmann1, Lucio Zugliani1, Christian Schmid1, Sven Ernst2, Stefanie Grotowski2, Simone Spedicato2, Björn Jonas1, Mirco Metz1, Kai Müller1, and Jonathan Finley2 — 1Walter Schottky Institute and Department for Electrical and Computer Engineering, Technical University of Munich, 85748 Garching, Germany — 2Walter Schottky Institute and Physics Department, Technical University of Munich, 85748 Garching, Germany
Superconducting single-photon detectors (SSPDs) play a crucial role in the rapidly growing field of quantum communication and computation. Hereby, NbTiN is an established candidate for superconducting thin films that is used as the active part of the SSPDs. To achieve high detection efficiencies, the superconducting properties of NbTiN films, deposited via magnetron sputtering, need to be optimized. In this contribution, we present transport measurements characterizing the influence of the deposition process onto the superconducting properties, which assists in a systematic optimization of the detectors. We are able to estimate detection efficiency and depairing current of the SSPDs, even before fabricating the nanostructures, utilizing the hotspot model and the Ginzburg-Landau model. Finally, we use the thin film transport measurements and detector measurements to assess the quality of our nanofabrication process.