Freiburg 2019 – wissenschaftliches Programm
FM 53.3: Talk
Mittwoch, 25. September 2019, 14:45–15:00, 1010
Prospects of GaAs-based quantum dots emitting in the telecom wavelength regime for quantum communication schemes — •Cornelius Nawrath1, Jingzhong Yang2, Robert Keil3, Michael Zopf2, Fabian Olbrich1, Matthias Paul1, Fei Ding2, Michael Jetter1, Simone Luca Portalupi1, Oliver Schmidt3, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart — 2Institute for Solid State Physics, Leibniz University of Hannover, Appelstr. 2, 30167 Hannover — 3IFW Dresden, Helmholtzstraße 20, 01069 Dresden
The emission of semiconductor quantum dots (QDs) has been shown to exhibit excellent properties in terms of single photon purity, photon indistinguishability and entanglement fidelity, i.e. essential prerequisites for quantum communication. Emission in the telecom O- or C-band will boost the range of communication schemes due to the favourable absorption and dispersion properties of silica fibers employed in the existing global fiber network. The coherence properties of photons emitted by InAs/InGaAs QDs emitting directly in the telecom C-band, are examined under above-band excitation and in resonance fluorescence. Furthermore, under two-photon excitation, the single-photon purity and post-selected degree of indistinguishability are determined. To boost the extraction efficiency, the applicability of an approach combining a nano-membrane containing QDs, with a GaP hemispherical lens is presented for a sample emitting in the telecom O-band.