Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 58: Quantum Dots: Optical Properties IV

HL 58.7: Vortrag

Mittwoch, 22. März 2017, 17:00–17:15, POT 151

Two-photon interference from deterministically fabricated remote quantum dot microlenses — •Peter Schnauber1, Alexander Thoma1, Jonas Boehm1, Manuel Gschrey1, Jan-Hindrik Schulze1, Andre Strittmatter2, Sven Rodt1, Tobias Heindel1, and Stephan Reitzenstein11Institut fuer Festkoerperphysik, Technische Universitaet Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany — 2Abteilung fuer Halbleiterepitaxie, Otto-von-Guericke Universitaet, 39106 Magdeburg, Germany

Two-photon interference (TPI) is of fundamental importance for the realization of quantum communication schemes such as the quantum repeater. Here, we report on TPI experiments in Hong-Ou-Mandel configuration using deterministically fabricated, remote single-photon sources [1]. By using 3D in-situ electron-beam lithography, we fabricate quantum-light sources at desired wavelengths by integrating pre-selected semiconductor quantum dots into monolithic microlenses. Exciting the quantum dot microlenses into their p-shell at 80 MHz, the individual "single photon" sources exhibit TPI visibilities of 49 % and 22 %, respectively. When examining the TPI of photons emitted by two remote sources, we measure an uncorrected TPI visibility of 29 %. This agrees with the visibility predicted from the dephasing of the individual emitters. Due to the broadband increase in photon extraction efficiency (> 20 nm), quantum dot microlenses are a promising technology platform for future entanglement swapping experiments employing entangled photon pairs from remote biexciton-exciton radiative cascades.

[1] A. Thoma et al., arXiv:1611.06859, 2016

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