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Physical review. B./Physical review. B

Publisher's Note: An artificial Rb atom in a semiconductor with lifetime-limited linewidth [Phys. Rev. B92, 245439 (2015)]

Jan-Philipp Jahn, Mathieu Munsch, Lucas Béguin, Andreas V. Kuhlmann, Martina Renggli, Yong-Heng Huo, Fei Ding, Rinaldo Trotta, Marcus Reindl, Oliver G. Schmidt, Armando Rastelli, Philipp Treutlein, Richard John Warburton

Published Apr 15, 2016• 2 citations
Publisher
DOI
10.1103/physrevb.93.159905

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We report results important for the creation of a best-of-both-worlds quantum hybrid system consisting of a solid-state source of single photons and an atomic ensemble as quantum memory. We generate single photons from a GaAs quantum dot (QD) frequency matched to the Rb D2D2D2 transitions and then use the Rb transitions to analyze spectrally the quantum dot photons. We demonstrate lifetime-limited QD linewidths (1.42 GHz) with both resonant and nonresonant excitation. The QD resonance fluorescence in the low power regime is dominated by Rayleigh scattering, a route to match quantum dot and Rb atom linewidths and to shape the temporal wave packet of the QD photons. Noise in the solid-state environment is relatively benign: there is a blinking of the resonance fluorescence at MHz rates but negligible dephasing of the QD excitonic transition. We therefore demonstrate significant progress towards the realization of an ideal solid-state source of single photons at a key wavelength for quantum technologies.