Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Quantum Dots and Wires: Single Photon Sources
HL 5.3: Vortrag
Montag, 7. März 2016, 10:15–10:30, H15
Semiconductor source of single photons frequency matched to Rb — •Jan-Philipp Jahn1, Lucas Béguin1, Mathieu Munsch1, Andreas Kuhlmann1, Martina Renggli1, Yongheng Huo2, Fei Ding3, Rinaldo Trotta2, Oliver G. Schmidt3, Armando Rastelli2, Philipp Treutlein1, and Richard J. Warburton1 — 1Department of Physics, University 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 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 physical systems to exploit the best features from both worlds. We have characterized a new type of self-assembled GaAs/AlGaAs quantum dots that emits lifetime-limited (Δ ν ∼ 1.42GHz) single-photons at a wavelength compatible with Rb atoms [1]. Fine tuning of the photon frequency to address the Rb D2-line is achieved via strain. To overcome the inherent bandwidth mismatch between the two disparate systems we excite the QD in the Rayleigh scattering regime. This allows a temporal shaping of the QD photons in pulsed resonant excitation, a prerequisite to achieve high storage efficiencies. Furthermore we performed pulsed Hong-Ou-Mandel measurements to directly quantify the indistinguishability, which constitutes a key aspect for quantum information networks. [1] Jahn et.al. arXiv:1508.06461