Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Quantum Information Systems: Mostly Concepts (jointly with HL)
TT 64.1: Vortrag
Mittwoch, 18. März 2015, 11:00–11:15, EW 202
Cold atom - semiconductor hybrid quantum system — •Jan-Philipp Jahn1, Mathieu Munsch1, Lucas Beguin1, Andreas Kuhlmann1, Aline Faber1, Tobias Kampschulte1, Andreas Jöckel1, Armando Rastelli2, Fei Ding3, Oliver G. Schmidt3, Nicolas Sangouard1, Philipp Treutlein1, and Richard J. Warburton1 — 1University of Basel, Switzerland — 2Johannes-Kepler University Linz, Austria — 3IFW Dresden, Germany
Semiconductor quantum dots are excellent single-photon sources, providing triggered single-photon emission at a high rate and with high spectral purity [1]. Independently, atomic ensembles have emerged as one of the best quantum memories for single photons, providing high efficiency storage and long memory lifetimes [2]. In this project, we combine these two 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 narrowband (Δv = 500 MHz) single-photons at a wavelength compatible with Rb atoms. Fine tuning of the photon frequency is achieved via strain. This allows us to perform 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 (OD>150) that achieves storage-and-retrieval efficiency exceeding 28% [3].
[1] R. J. Warburton, Nature Mater. 121, 483-493 (2013) [2] F. Bussières et al., J. Mod. Opt. 60, 1519 (2013) [3] M. T. Rakher et al., Phys. Rev. A 88, 053834 (2013)