Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Quantum Dots and Wires 2: Optics 1
HL 8.4: Vortrag
Montag, 5. September 2022, 16:00–16:15, H32
Maximally entangled and GHz-clocked on-demand photon pair source — •Caspar Hopfmann1, Weijie Nie1, Nand Lal Sharma1, Carmen Weigelt1, Fei Ding2, and Oliver G. Schmidt1,3,4 — 1Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany — 3Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany — 4Nanophysics, Faculty of Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, 01062 Dresden, Germany
We present a 1 GHz-clocked, maximally entangled and on-demand photon pair source based on droplet etched GaAs quantum dots using two-photon excitation. By employing these GaP microlens-enhanced devices in conjunction with their substantial brightness, raw entanglement fidelities of up to 0.95 and post-selected photon indistinguishabilities of up to 0.93, the suitability for quantum repeater based long range quantum entanglement distribution schemes is shown. Comprehensive investigations of a complete set of polarization selective two-photon correlations facilitate an innovative method to determine the extraction and excitation efficiencies directly - opposed to commonly employed indirect techniques. Additionally, time-resolved analysis of Hong-Ou-Mandel interference traces reveal an alternative approach to the investigation of pure photon dephasing.