Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Focus Session: Quantum Nanophotonics in Solid State Systems I (joint session HL/TT)
TT 39.13: Vortrag
Dienstag, 13. März 2018, 14:30–14:45, EW 201
Heterogeneous quantum networks: Combine QDs with long lived atomic quantum memories — •Janik Wolters1, Lucas Béguin1, Roberto Mottola1, Jan-Philipp Jahn1, Andrew Horsley1, Fei Ding2, Armando Rastelli3, Oliver G. Schmidt2, Richard J. Warburton1, and Philipp Treutlein1 — 1Universität Basel, Department Physik, Switzerland — 2IFW Dresden, Germany — 3Johannes-Kepler Universität Linz, Austria
Semiconductor quantum dots (QDs) are excellent single-photon sources, providing triggered single-photon emission at a high rate and with high spectral purity. Independently, atomic ensembles have emerged as one of the best quantum memories for single photons, providing high efficiency storage and long memory lifetimes. We aim at combining these two disparate physical systems to exploit the best of both worlds. For this, the bandwidth mismatch between QDs typically emitting GHz-broad photons and atomic lines of 10 MHz width must be solved. We demonstrate a scheme to generate temporally shaped narrow-bandwidth single photons with QDs [1], and we push forward an EIT-based quantum memory to store broadband photons in a dense ensemble of 87Rb atoms [2].
[1] L. Béguin et al., On-demand semiconductor source of 780 nm single photons with controlled temporal wave packets, arXiv:1710.02490 (2017).
[2] J. Wolters et al., Simple atomic quantum memory suitable for semiconductor quantum dot single photons, Phys. Rev. Lett. 119 060502 (2017).