Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Nano-Optics I
Q 12.5: Vortrag
Montag, 6. März 2017, 18:00–18:15, P 11
Generation of single photons with tailored waveforms using a quantum dot emitting near the Rb D2 line — •Janik Wolters1, Jan-Philipp Jahn1, Lucas Beguin1, Mathieu Munsch1, Yongheng Huo2, Fei Ding3, Rinaldo Trotta2, Markus Reindl2, Oliver G. Schmidt3, Armando Rastelli2, Philipp Treutlein1, and Richard J. Warburton1 — 1University of Basel — 2Johannes Kepler University Linz — 3IFW Dresden
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. We have recently demonstrated the emission of high quality photons from a single droplet quantum dot emitting at the Rb D2 transition [1]. However, there is a significant mismatch between the large bandwidth of the quantum dot photons and the relatively small bandwidth of a Rb ensemble. We present here a route to creating photons with a tailored waveform by exploiting a long-lived hole spin in a droplet quantum dot. The quantum dot spin is prepared in one of the spin states and is then driven into the other spin state by a control laser whose waveform determines the waveform of the photon. We demonstrate the creation of 10−100 ns duration waveforms with single-photon character thereby overcoming the bandwidth mismatch.
[1] J.-P. Jahn et al., Phys. Rev. B 92, 245439 (2015)