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Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Cryogenic Detectors and Cryotechnique

TT 17.7: Talk

Wednesday, September 7, 2022, 11:15–11:30, H22

Superconducting single-photon detectors on lithium-niobate-on-insulator — •Christian Schmid1, Rasmus Flaschmann1, Lucio Zugliani1, Stefan Strohauer2, Björn Jonas1, Fabian Wietschorke1, Sven Ernst2, Stefanie Grotowski2, Simone Speticato2, Mirco Metz1, Kai Müller1, and Jonathan Finley21Walter Schottky Institute and Department for Electrical and Computer Engineering, Technical University of Munich, Germany — 2Walter Schottky Institute and Physics Department, Technical University of Munich, Germany

Superconducting single-photon detectors (SSPDs) are a key building block in photon-based quantum computation and communication. To realize a scalable photonic quantum computer, integration of single-photon sources, electronics and crucially SSPDs is necessary. One of the most promising material platforms for quantum photonic integration is lithium-niobate-on-insulator (LNOI), which offers a broad optical window and a large non-linearity.
In this work, we present the thin film superconducting properties of NbTiN grown on crystalline LNOI and compare them to films deposited on amorphous Si/SiO2 wafer. SSPDs fabricated from films on both substrates are further characterized with respect to their quantum efficiency, dark count rate, recovery time and timing jitter.

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