Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Focus Session: Quantum Light Sources Based on Solid State Systems: Status and Visions II (organized by HL)
TT 52.3: Talk
Tuesday, April 1, 2014, 14:45–15:00, POT 251
Indistinguishable photons generated from deterministic quantum light sources fabricated by in-situ electron-beam lithography — •Tobias Heindel, Luzy Krüger, Elisabeth Schlottmann, Manuel Gschrey, Marc Seifried, Ronny Schmidt, Jan-Hindrik Schulze, Sven Rodt, André Strittmatter, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623, Germany
Quantum communication technology relies vitally on efficient non-classical light sources emitting single indistinguishable photons on demand. A promising approach to realize such light sources is based on single self-assembled semiconductor quantum dots (QDs) embedded into microcavity systems. The main challenge of this approach is the precise control of the coupling between the statistically grown QD and the optical mode of the microcavity. In this work we tackle this issue by using in-situ electron-beam lithography to embed target QDs deterministically into sub-µm mesa structures [1] as well as microlenses with enhanced photon extraction efficiency. The huge potential of this device technology is demonstrated by quantum optical studies which reveal distinct excitonic emission lines with resolution limited linewidths below 10 µeV and a strong suppression of multi-photon emission events associated with g(2)(0)<0.04. Furthermore, Hong-Ou-Mandel type two-photon interference experiments are used to analyze the indistinguishability of the emitted photons.
M. Gschrey et al., APL 102, 251113 (2013).