Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.35: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

An open-fiber cavity system for quantum dot spectroscopy — •Moritz Meinecke, Peter Gschwandtner, Sven Höfling, and Tobias Huber-Loyola — Technische Physik, Physikalisches Institut Würzburg, 97074 Würzburg, Germany

Single-photon sources are an essential resource for quantum communication and quantum computing. Semiconductor quantum dots have been proven to be a great platform for delivering single photons on demand. Embedding quantum dots in so-called open cavities, improves the device performance due to a higher extraction efficiency of the single-photons stream. Overall efficiencies of > 70 % have been shown in such type of cavities.

Laser ablation techniques made it possible to imprint a curved mirror into the tip of a fiber, enabling to design fiber-based Fabry-Pérot cavities. The advantage of fiber-based cavities is the support of smaller mode volumes compared to conventional Fabry-Pérot cavities based on bulk optical mirrors. A small mode volume allows easier exploitation of the Purcell effect to increase the source brightness. Here, we present our design of a single photon source based on InAs quantum dots embedded in a fiber-based Fabry-Pérot cavity.

Keywords: Open cavity; Fabry-Pérot cavity; Single-photon source; quantum dot