Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)
TT 56.12: Vortrag
Mittwoch, 14. März 2018, 13:00–13:15, EW 201
Strain tuning of deterministically fabricated quantum dot microlenses for advanced quantum communication — •Sarah Fischbach, Marco Schmidt, Ronny Schmidt, Arsenty Kaganskiy, André Strittmatter, Tobias Heindel, Sven Rodt, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Germany
Long distance quantum communication requires networks of quantum repeaters, which are based on the generation of indistinguishable pairs of entangled photons. Quantum dots (QDs) can generate entangled photons from their exciton-biexciton cascade and methods of semiconductor nanofabrication allow one to realize efficienct sources emitting highly indistinguishable photons.
Due to the random nature of the self-assembled growth process, QDs vary over a wide range in their emission wavelength. Deterministic nanoprocessing needs to be applied to integrate QDs matching a target wavelength. Additionally, to enable entaglement distribution, two QD-based sources need to be tuned into resonance by spectral fine-tuning. Strain tuning is a very accurate tuning method which maintains the high optical quality of the QD emission.
We demonstrate a tunable single-photon source based on a deterministically fabricated QD microlens which is positioned on top of a piezoactuator by a flip-chip goldbonding technique. QD microlenses can act as efficient single-photon sources with low g(2)(0)-values and a high photon indistinguishability, which are now equipped with the feature of strain tunability.