Quantum 2025 – scientific programme
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TUE: Tuesday Contributed Sessions
TUE 1: QIP Implementations: Photons III
TUE 1.6: Talk
Tuesday, September 9, 2025, 15:30–15:45, ZHG001
Hetero-integration of diamond nanostructures on AlGaN-based photonic circuits — •Domenica Romina Bermeo Alvaro1,2, Sinan Gündogdu1,2, Lea M. Rektorschek2, Pascal Frehle2, Marco E. Stucki1,2, Maarten H. van der Hoeven2, Julian M. Bopp2,1, Tim Kolbe2, Sylvia Hagedorn2, Markus Weyers2, Tommaso Pregnolato1,2, and Tim Schröder2,1 — 1Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany — 2Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
Spin-photon interfaces are crucial for the development of large quantum networks. A highly efficient spin-photon interface can be achieved when diamond color centers are embedded in photonic crystal cavities, which enhance the light-matter interaction and boost the emission rate of photons generated by the coherent zero-phonon-line transition. While the diamond substrate allows for the nanofabrication of such devices, achieving a monolithic platform that will take advantage of those photonic crystal cavities on a large scale remains a challenge. To overcome these limitations, we propose the hetero-integration of diamond nanostructures into AlGaN-based photonic circuits. By embedding diamond nanostructures within AlGaN-based circuits, we aim to create highly efficient, scalable spin-photon interfaces. Our approach involves the design, fabrication and characterization of a low-loss coupling section between diamond and AlGaN waveguides. Finally, we show the first integration on an AlGaN-based photonic circuit of a Sawfish cavity, our newly proposed photonic crystal cavity.
Keywords: sawfish cavity; AlGaN; photonic integrated circuits; hetero-integration; nanostructures