Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 37: Poster IV

HL 37.8: Poster

Wednesday, March 20, 2024, 18:00–20:30, Poster F

Towards an Open-Tunable Fiber Cavity for Enhanced Directionality in Single Photon Emission — •Paul Steinmann¹, Stefan Linden¹, and Beata Kardynal² — ¹Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany — ²PGI-9, Forschungszentrum Jülich, Jülich, Germany

Advancements in quantum communication technologies demand the development of robust single photon sources. Indium-Arsenide quantum dots, which act akin to atomic systems, have been recognized as a bright source for single photons of high quality. These quantum dots, situated in high refractive index GaAs, typically exhibit non-directional photon emission, making their integration into optical fibers for practical applications challenging. We propose and implement an open-tunable fiber micro cavity as a solution to this challenge. Our approach involves the careful construction of a cryostat insert, ensuring mechanical stability under low-temperature conditions. This cavity enhances the rate and directionality of single photon emission, allowing for efficient photon generation and direct coupling into optical fibers. The design and construction of this fiber cavity are focused on stability and minimizing photon loss, thereby optimizing the efficiency of single photon sources for quantum technologies.

Keywords: Quantum Dots; Fiber Micro Cavity; Single Photon Sources; Cryogenic Setup; Quantum Technologies