Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Materials and Devices for Quantum Technology 2

HL 36.10: Talk

Thursday, September 8, 2022, 17:30–17:45, H36

Bright InAs quantum dot based single-photon sources at telecom wavelengths — •Monica Pengerla¹, Alkaales Mohanad², Ranbir Kaur², Jan Donges¹, Lucas Bremer¹, Johannes Schall¹, Sven Rodt¹, Mohamed Benyoucef², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 — ²Institute of Nanostructure Technologies and Analytics (INA), Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Quantum dot (QD) based single-photon sources are key elements of photonic quantum networks. Most interesting are sources emitting at telecom wavelengths to enable long distance quantum communication. Here, we report on deterministically fabricated single-photon sources based on InAs QDs grown on InP substrate. Numerical simulations of such QD heterostructures with backside distributed Bragg reflector and reveal photon extraction efficiency exceeding 50% when integration the QD into mesa or circular Bragg grating structures. The numerical designs are implemented by deterministic device processing using machine learning enhanced in-situ electron beam lithography. Micro-photoluminescence studies reveal the excellent optical and quantum optical properties of the fabricated quantum devices.