Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 34: Quantum Dots and Wires: Telecom Wavelength
HL 34.5: Vortrag
Mittwoch, 11. März 2026, 17:30–17:45, POT/0051
Automated optical imaging for telecom Quantum Dot deterministic fabrication — •Eden Arbel1, Lukas Wagner1, Peter Gierß1,2, Ponraj Vijayan1, Michal Vyvlecka1, Michael Jetter1, Simone L. Portalupi1, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Physikalisch Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
Semiconductor quantum dots (QDs) are promising sources of single- and entangled-photon pairs. Due to its low absorption in silica fibers, operation in the telecom C-band (1530-1565nm) is desired. Integrating these QDs into Circular Bragg Grating cavities (CBGs) enhances extraction efficiency and enables Purcell enhancement. Our method employs wide-field imaging for deterministic preselection of QDs for subsequent CBG fabrication. The QD positions are referenced using e-beam-written markers. Smart preselection of suitable candidates, embedded in an automated setup, promises higher yield and efficiency, with the potential for AI integration. We demonstrate that deterministically processed CBGs exhibit significant improvements in brightness and enhance the decay time of the two-level state. With higher throughput and continually improving quality of telecom QD samples, this approach will enable to provide single-photon sources tailored to specific needs of various applications, such as quantum memories or long-distance quantum communication.
Keywords: Quantum Dots; Telecom; Imaging; Automation; Deterministic Cavities