Ultrafast quantum key distribution using fully parallelized quantum channels

Terhaar, Robin; Rödiger, Jasper; Häußler, Matthias; Wahl, Michael; Gehring, Helge; Wolff, Martin A.; Beutel, Fabian; Hartmann, Wladick; Walter, Nicolai; Hanke, Jonas; Peter, Hanne,; Walenta, Nino; Diedrich, Maximilian; Perlot, Nicolas; Tillmann, Max; Röhlicke, Tino; Ahangarianabhari, M.; Schuck, Carsten; Pernice, Wolfram H. P.

doi:10.48550/arxiv.2207.07345

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“…In recent years photon-based quantum technologies have made great progress in various fields [1], such as deep space optical communication using photons [2,3], quantum computation [4], on-chip photonic circuits [5,6], or quantum key distribution [7,8]. Such applications require special components such as single-photon emitters (e.g.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the growth conditions of Al mirrors for superconducting nanowire single-photon detectors

Flaschmann

Schmid

Zugliani

et al. 2023

Mater. Quantum. Technol.

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We investigate the growth conditions for thin (≤ 200 nm) sputtered aluminum (Al) films. These coatings are needed for various applications, e.g. for advanced manufacturing processes in the aerospace industry or for nanostructures for quantum devices. Obtaining high-quality films, with low roughness, requires precise optimization of the deposition process. To this end, we tune various sputtering parameters such as the deposition rate, temperature and power, which enables 50 nm thin films with a root mean square (RMS) roughness of less than 1 nm and high reflectivity. Finally, we confirm the high quality of the deposited films by realizing superconducting single-photon detectors integrated into multi-layer heterostructures consisting of an aluminum mirror and a silicon dioxide dielectric spacer. We achieve an improvement in detection efficiency at 780 nm from 40 % to 70 % by this integration approach.

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