Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 82: Quantum dots and wires: Cavities and photons
HL 82.4: Vortrag
Donnerstag, 14. März 2013, 15:45–16:00, H2
Free-space quantum key distribution over 500 m using electrically triggered quantum dot - micropillar single photon sources — •Sebastian Unsleber1,5, Tobias Heindel1,5, 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, 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 (SPS). First experiments utilizing optically pumped solid state based SPSs affirmed the great potential of QKD but still suffered from the drawbacks of this excitation scheme. In this work we report on a free-space QKD experiment over 500 m using electrically triggered quantum dot - micropillar SPSs. These devices generate sifted key rates of up to 16.8 kBits/s at a quantum bit error rate of 5.9 % and g(2)(0)-values down to 0.39.