Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: Poster II
HL 14.8: Poster
Montag, 18. März 2024, 15:00–18:00, Poster F
Quantum-state tomography of polarization-entangled telecom photons from semiconductor quantum dots — •Ilenia Neureuther1, Tim Strobel1, Stefan Kazmaier1, Tobias Bauer2, Marlon Schäfer2, Ankita Choudhary3, Nand Lal Sharma3, Raphael Joos1, Cornelius Nawrath1, Weijie Nie3, Ghata Bhayani3, André Bisquerra1, Caspar Hopfmann3, Simone L. Portalupi1, Christoph Becher2, and Peter Michler1 — 1Institut für Halbleiter und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, Germany — 2Fachrichtung Physik, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany — 3Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
For the future development of quantum communication, triggered entangled-photon pairs are of fundamental importance. The integration of single photons into existing optical fiber networks requires the use of telecom wavelengths. Semiconductor quantum dots (QDs) are promising candidates for providing on-demand, indistinguishable polarization-entangled photon pairs. Here, we generate photons emitted via the biexciton-exciton cascade in GaAs QDs formed via Al droplet etching, emitting at 780nm. In a bi-directional polarization-conserving quantum frequency converter, we convert the biexciton emission to 1515nm. Polarization-entanglement is measured after the transmission through a 35km inner-city fiber network.
Keywords: Entangled-photon pairs; GaAs QDs; Quantum frequency conversion; Telecom wavelengths; Urban fiber network