Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 55: Quantum Dots and Wires: (Single) Photonics
HL 55.7: Vortrag
Freitag, 13. März 2026, 11:15–11:30, POT/0251
An ultra-compact deterministic source of maximally entangled photon pairs — Moritz Langer1, Pavel Ruchka2, Ahmad Rahimi1, Sara Jakovljevic2, Yared G. Zena1, Sai Abhishikth Dhurjati1, Alexey Danilov1, Mandira Pal1, Riccardo Bassoli3, Frank H. P. Fitzek3, Oliver G. Schmidt4, Harald Giessen2, and •Caspar Hopfmann1,2 — 1Institute for Emerging Electronic Technologies, IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 24th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany — 3Deutsche Telekom Chair of Communication Networks, Technische Universität Dresden, Dresden, Germany — 4Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, Chemnitz, Germany
We demonstrate an ultra-compact source of on-demand, maximally entangled photon pairs using single GaAs quantum dots in monolithic microlenses, efficiently fiber-coupled in a cryogenic environment. A 3D-printed micro-objective facilitates near-diffraction-limited performance at 3.8 K. The system achieves high single-photon emission rates (392(20) kHz) and purities (0.992(5)) via two-photon resonant excitation. Leveraging the exciton-biexciton cascade, it produces near-maximally entangled photon pairs (peak entanglement negativities of 2n=0.96(2)). This quantum light source combines state-of-the-art performance and stability with a dramatically reduced footprint, well-suited for seamless industrial integration.
Keywords: GaAs Quantum Dots; Nanofabrication; Microoptics; Entangled Photon Sources; Quantum Light Sources