Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Quantum Dots and Wires: Single Photon Sources
HL 5.4: Vortrag
Montag, 7. März 2016, 10:30–10:45, H15
An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency — •Tobias Heindel1, Alexander Schlehahn1, Alexander Thoma1, Pierce Munnelly1, Martin Kamp2, Sven Höfling2,3, Christian Schneider2, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany — 2Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, United Kingdom
Single semiconductor quantum dots (QDs) integrated into photonic microstructures are promising candidates for the realization of high-fidelity and high-speed quantum-light sources [1]. Besides a high single-photon flux and vanishing multi-photon emission probabilities, the photon-indistinguishability is a crucial attribute for quantum information processing schemes.
In this work, we report on state-of-the-art electrically triggered sources of single and indistinguishable photons. Exploiting the Purcell-effect and the highly-directional emission of electrically contacted QD micropillar cavities operated at excitation repetition rates up to 1.2 GHz, we extract cavity-enhanced single-photon emission with record-high efficiencies of (61 ± 11) %. Moreover, two-photon interference experiments reveal a photon-indistinguishability of (41.1 ± 9.5) % under pulsed current injection at 487 MHz.
[1] G.-C. Shan et al., Front. Phys. 9, 170 (2014)