SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.48: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Towards frequency-converted polarization-entangled photon pairs from semiconductor quantum dots — •Tim Strobel¹, Andre Bisquerra¹, Tobias Bauer², Nand Lal Sharma³, Marlon Schäfer², Stefan Kazmaier¹, Cornelius Nawrath¹, Lukas Wagner¹, Ankita Choudhary³, Michael Jetter¹, Caspar Hopfmann³, Christoph Becher², Simone L. Portalupi¹, and Peter Michler¹ — ¹Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Science and Technology (IQ^ST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — ²Fachrichtung Physik, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany — ³Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany

Fiber-based distribution of entangled, single photon pairs is a key requirement for future developments of terrestrial quantum networks. Quantum repeater schemes at telecom wavelengths can overcome the restriction set by fiber transmission losses over long distances. In this context semiconductor quantum dots (QDs) are promising candidates as deterministic sources of on-demand polarization-entangled photon pairs. Here, we investigate photons emitted via the biexciton-exciton cascade of GaAs QDs grown via Al droplet etching and integrated into a GaP solid immersion lens. To be compatible with existing fiber network infrastructures, quantum frequency conversion is employed to convert the QD emission from 780nm to telecom wavelengths.