Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Optomechanics and Photonics

Q 40.11: Poster

Mittwoch, 16. März 2022, 16:30–18:30, P

Waveguide-Intergrated Superconducting Nanowire Avalanche Single-Photon Detectors — •Connor A. Graham-Scott1,2, Erik M. Baldauf1,2, Matthias Häußler1,2, Mikhail Yu. Mikhailov3, and Carsten Schuck1,21University of Münster, Physics Institute, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2CeNTech - Center for NanoTechnology, Heisenbergstr. 11, 48149 Münster, Germany — 3B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 61103 Kharkiv, Ukraine

Superconducting nanowire single-photon detectors (SNSPDs) are of great interest for applications in quantum sciences and technologies. SNSPDs fabricated from amorphous superconducting thin films adapt to a wide range of substrate-materials and show high sensitivities over broad spectral range. A drawback of these however is a low signal-to-noise ratio of the electrical output resulting from a lower critical current when operated close to the superconductor*s critical temperature in user-friendly cost-efficient cryogenic systems.

This challenge can be overcome by parallelizing SNSPDs in an avalanche system to create a superconducting nanowire avalanche single photon detector (SNAP).

Here we show how SNAPs can be integrated with nanophotonic circuitry to allow for on-chip single-photon counting with ultra-high signal-to-noise ratio. We furthermore present simulation results on how the SNAP architecture can benefit both internal and absorption efficiencies of waveguide-integrated SNSPDs.

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