Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Quantum Dots and Wires 4: Devices

HL 17.1: Vortrag

Mittwoch, 7. September 2022, 09:30–09:45, H32

Highly Pure and Bright Emission of a Telecom C-Band Quantum Dot in a Circular Bragg Grating Cavity — •Raphael Joos, Cornelius Nawrath, Sascha Kolatschek, Stephanie Bauer, Pascal Pruy, Robert Sittig, Ponraj Vijayan, Jiasheng Huang, Michael Jetter, Simone L. Portalupi, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, Universität Stuttgart

Quantum communication schemes, which can prospectively guarantee secure communication by physical laws, rely on the availability of single-photons utilized as flying qubits. For this purpose, InAs quantum dots (QDs) can be employed as single-photon source, particularly, providing access to emission at telecom wavelengths which is highly sought-after for fiber-based applications and will, thus, most probably be the operating regime for real-world applications. However, simple planar QD structures suffer from a low collection efficiency due to the high refractive index contrast at the semiconductor/air interface. This issue can be tackled by the application of photonic nanostructures. This contribution deals with the optical and quantum optical investigation of telecom C-band QDs embedded in circular Bragg grating cavities, which allow for strongly increased light collection in a broad range of wavelengths as well as Purcell enhanced emission of the QDs. In this way, QD emission with a near perfect single-photon purity as well as very high collection efficiency is achieved leading to megahertz count rate of actual single-photons available for further applications.