Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 104: Quantum Dots and Wires: Optical Properties V (mainly Indiviual Photons)
HL 104.8: Talk
Friday, March 30, 2012, 13:30–13:45, EW 201
Quantum key distribution using electrically triggered quantum dot - micropillar single photon sources — •Tobias Heindel1, Markus Rau2, Christian Schneider1, Martin Fürst2,3, Sebastian Nauerth2,3, Matthias Lermer1, Henning Weier2,3, Stephan Reitzenstein1,5, Alfred Forchel1, Sven Höfling1, Harald Weinfurter2,4, and Martin Kamp1 — 1Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 Munich, Germany — 3qutools GmbH, 80539 Munich, Germany — 4Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 5Present address: Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
In 1984, Bennett and Brassard proposed a secret key-distribution protocol (BB84) that uses the quantum mechanical properties of single photons to avoid the possibility of eavesdropping on an encoded message. So far, most quantum key distribution (QKD) experiments have been performed with strongly attenuated lasers due to the lack of efficient single photon sources. First experiments utilizing optically pumped solid state based single photon sources affirmed the great potential of QKD but still suffered from the drawbacks of this excitation scheme. In this work we report on a QKD experiment using electrically triggered quantum dot - micropillar single photon sources. These optimized devices generate sifted key rates of up to 35.4 kBits/s at a quantum bit error rate of 3.8 % and g(2)(0)-values down to 0.148.