SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.52: Poster
Monday, March 27, 2023, 13:00–15:00, P2/EG
Development and deterministic nanofabrication of quantum dot based single-photon sources with emission in the 780 nm-930 nm range — •Dinara Basharova1, Stephan Reitzenstein1, Sven Rodt1, Caspar Hopfmann2, Nand Lal Sharma2, Normen Auler3, and Dirk Reuter3 — 1Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany — 2Leibniz Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany — 3Center of Optoelectronics and Photonics, Universität Paderborn, 33098 Paderborn, Germany
Important goals of quantum technology are to demonstrate the elementary building blocks of a quantum repeater and to integrate them into the infrastructure of a quantum network. A network of quantum repeaters allows the distribution of quantum entanglement, thereby enabling secure exchange of information between multiple parties. To implement such building blocks, we use semiconductor heterostructures (HS) with GaAs quantum dots (QDs) integrated into circular Bragg gratings (CBG). GaAs QDs are excellent single-photon emitters with almost negligible multi-photon emission probability and photon extraction efficiencies exceeding 60%. For this purpose, we deterministically integrate QDs on structures with back-side distributed Bragg reflector and in hybrid approach with backside Au mirror for comparison. In-situ electron beam lithography (iEBL) is an ideal technique for deterministic fabrication of such QD-based quantum light sources. The fabricated QDs are characterized by microphotoluminescence and quantum optical spectroscopy.