Related papers: Waveguide-integrated colour centres in silicon carbide with broadband photonic crystal reflectors for efficient readout

Waveguide-integrated colour centres in silicon carbide with broadband photonic crystal reflectors for efficient readout

URL: http://arxiv.org/abs/2512.20200v1
Date: Tue, 23 Dec 2025 09:47:44 GMT
Title: Waveguide-integrated colour centres in silicon carbide with broadband photonic crystal reflectors for efficient readout
Authors: Marcel Krumrein, Julian M. Bopp, Timo Steidl, Wolfgang Knolle, Jawad Ul-Hassan, Vadim Vorobyov, Tim Schröder, Jörg Wrachtrup,
Abstract summary: Device shows broadband reflection over a range of 60 THz with a peak reflectance above 80 %.<n>Count rates enable optical single-shot readout with a fidelity exceeding 98 %.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Spin-active colour centres in 4H silicon carbide are promising candidates as building blocks for quantum information applications. To increase the photon count rate of the emitters at low temperatures, the colour centres must be integrated into nanophotonic structures and characterised under cryogenic conditions. Here, we design and fabricate waveguide structures attached with an efficient Dinosaur photonic crystal reflector at one side. The devices show broadband reflection over a range of 60 THz with a peak reflectance above 80 %. Additionally, colour centres were integrated into these structures and characterised at cryogenic conditions. The emission was collected by a tapered-waveguide-tapered-fibre interface. Although the spectral stability of the emitters must be further improved for high excitation powers, the saturation intensity in standard PLE measurements is about 104 kcps. The count rate can be further improved to about 125 kcps with a charge-resonance check measurement scheme. To highlight the relevance of our devices, we theoretically show that these count rates enable optical single-shot readout with a fidelity exceeding 98 %.

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