Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Nano-Optics III
Q 56.6: Vortrag
Donnerstag, 26. März 2015, 15:45–16:00, C/HSO
Cold atom-semiconductor hybrid quantum system — •Lucas Béguin1, Fei Ding2, Aline Faber1, Jan-Philipp Jahn1, Andreas Jöckel1, Tobias Kampschulte1, Andreas Kuhlmann1, Mathieu Munsch1, Armando Rastelli3, Nicolas Sangouard1, Oliver G. Schmidt2, Philipp Treutlein1, and Richard J. Warburton1 — 1Universität Basel, Departement Physik, CH-4056 Basel — 2IFW Dresden, Germany — 3Johannes-Kepler University Linz, Austria
Semiconductor quantum dots 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. In this project, we combine these two disparate physical systems to exploit the best features from both worlds. On the one hand, we have characterized a new type of self-assembled GaAs/AlGaAs quantum dots that emit anti-bunched, narrow-band single-photons (Δ ν ∼ 500 MHz) at a wavelength compatible with Rb atoms. Fine tuning of the photon frequency is achieved via strain. This allowed us to perform a spectroscopy of the Rb D2-line at the single-photon level, proving that we can address the different hyperfine transitions. On the other hand, we have developed a detailed theory of an EIT-based memory scheme in a dense ultracold ensemble of 87Rb atoms (OD150) that achieves storage-and-retrieval efficiency exceeding 28%. In the long term, such a memory will form the basis for experiments on hybrid entanglement and quantum networks.