Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 18: Poster II
QI 18.36: Poster
Wednesday, March 20, 2024, 11:00–14:30, Poster A
Photonic Integration of Diamond Qubits into Hybrid Circuits — •Maarten H. van der Hoeven1, Julian M. Bopp1,2, Tommaso Pregnolato1,2, Marco Stucki1,2, Alok Gokhale1, Lea M. Rektorschek1, Sinan Gündoğdu1,2, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Department of Physics, Berlin, Germany — 2Ferdinand-Braun-Institute, Berlin, Germany
Quantum photonic circuits are fundamental building blocks for quantum information applications, like secure communication or quantum computing. Hybrid photonic systems combine different materials to leverage their individual strengths. Our devices are based on color centers in diamond nanocavities coupled to an AlGaN/AlN guiding layer on a sapphire substrate.
Here we report on the characterization of recently fabricated "Sawfish" cavities [1]. These cavities show high quality factors and mode resonances that precisely follow the behavior expected from the corresponding design parameters [2]. For the scalable fabrication of "Sawfish" cavities coupled to single color centers we are working on the development of a deterministic coupling method. This method is based on the localization of color centers and subsequent fabrication of nanocavities around them. Furthermore, we numerically optimized the photon transfer between diamond and AlGaN/AlN waveguides by using tapered regions in both materials. Combining these methods facilitates the assembly of fully integrated quantum photonic circuits.
[1] J. M. Bopp et al., arXiv:2210.04702 (2022).
[2] T. Pregnolato et al., arXiv:2311.03618 (2023).
Keywords: Color centers; Diamond; Photonic Integration; Hybrid circuit