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HL: Fachverband Halbleiterphysik

HL 51: Focus Session: Hybrid Quantum-Dot / Atom Systems

HL 51.3: Vortrag

Mittwoch, 22. März 2017, 10:15–10:30, POT 112

Generation of single photons with tailored waveforms using a quantum dot emitting at the Rb D2 line — •Jan-Philipp Jahn¹, Lucas Béguin¹, Janik Wolters¹, Mathieu Munsch¹, Yongheng Huo², Fei Ding³, Rinaldo Trotta², Markus Reindl², Oliver G. Schmidt³, Armando Rastelli², Philipp Treutlein¹, and Richard J. Warburton¹ — ¹University of Basel, CH-4056 Basel, Switzerland — ²Johannes Kepler University Linz, A-4040 Linz, Austria — ³IFW Dresden, D-01069 Dresden, Germany

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)