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. Warburton11University 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)

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