Enhancing detection efficiency and transport properties of NbTiN SNSPDs using helium ion irradiation

Stefan Strohauer; Fabian Wietschorke; Lucio Zugliani; Rasmus Flaschmann; Christian Schmid; Sven Ernst; Stefanie Grotowski; Simone Spedicato; Noah Ploch; Fabian Flassig; Matthias Althammer; Rudolf Gross; Kai Müller; Jonathan Finley

doi:10.1117/12.2647912

9 March 2023 Enhancing detection efficiency and transport properties of NbTiN SNSPDs using helium ion irradiation

Stefan Strohauer, Fabian Wietschorke, Lucio Zugliani, Rasmus Flaschmann, Christian Schmid, Sven Ernst, Stefanie Grotowski, Simone Spedicato, Noah Ploch, Fabian Flassig, Matthias Althammer, Rudolf Gross, Kai Müller, Jonathan Finley

Author Affiliations +

Proceedings Volume PC12446, Quantum Computing, Communication, and Simulation III; PC1244608 (2023) https://doi.org/10.1117/12.2647912
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

Nowadays, Superconducting Nanowire Single-Photon Detectors (SNSPDs) play a significant role in quantum technologies and for general faint light detection. Typically, NbTiN SNSPDs are at most 8nm thick to achieve single-photon sensitivity. However, as absorption increases with film thickness, it is desirable to use thicker films of 10 or 12nm considering that the absorption probability places an upper limit for the achievable system detection efficiency. In this contribution, we present for the first time 12nm thick NbTiN SNSPDs that show an increase of system detection efficiency from less than 0.01% to 55% and saturating internal detection efficiency at 4K after irradiation with helium ions. Furthermore, we investigated the influence of helium ion irradiation on the transport properties of the underlying superconducting films.

Conference Presentation

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Stefan Strohauer, Fabian Wietschorke, Lucio Zugliani, Rasmus Flaschmann, Christian Schmid, Sven Ernst, Stefanie Grotowski, Simone Spedicato, Noah Ploch, Fabian Flassig, Matthias Althammer, Rudolf Gross, Kai Müller, and Jonathan Finley "Enhancing detection efficiency and transport properties of NbTiN SNSPDs using helium ion irradiation", Proc. SPIE PC12446, Quantum Computing, Communication, and Simulation III, PC1244608 (9 March 2023); https://doi.org/10.1117/12.2647912

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