Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 1: Nanophotonics - Devices I (Focused Session together with HL)
DS 1.2: Topical Talk
Monday, March 22, 2010, 10:45–11:15, H2
Self-organized quantum dots as single and entangled photon emitters — •Erik Stock1, Waldemar Unrau1, Anatol Lochmann1, Jan Amaru Töfflinger1, Andrei Schliwa1, Irina Ostapenko1, Murat Öztürk1, Sven Rodt1, Till Warming1, Askhat K. Bakarov2, Aleksandr I. Toropov2, Ilia A. Derebezov2, Vladimir Haisler2, and Dieter Bimberg1 — 1Institut für Festkörperphysik, TU-Berlin, 10623 Berlin, Germany — 2Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
The development of semiconductor based single photon and entangled photon emitters with high efficiency will be a fundamental element for quantum key distribution systems. We have developed InGaAs/GaAs quantum dot (QD) based Resonant-Cavity LEDs (RC-LED). The resonant cavity leads to an increased external quantum efficiency and due to the Purcell effect to an increased spontaneous emission rate allowing us to electrically pump the single QD at 1 GHz repetition rate.
The biexciton-exciton recombination cascade can be used for the generation of entangled photon pairs, if the finestructure splitting (FSS) of the exciton bright states is less than the homogenous line width. Using 8-band k·p theory we predict that symmetric QDs grown on (111) GaAs substrate will demonstrate a vanishing FSS. Mikro-photoluminescence spectroscopy on single QDs grown on (111) GaAs demonstrates a FSS < 10 µeV limited by the spectral resolution of our setup. This work was partly funded by the SFB 787 and the SfP 982735.