Free space quantum key distribution over 500 meters using electrically driven quantum dot single-photon sources-a proof of principle experiment

Rau, Markus; Heindel, Tobias; Unsleber, Sebastian; Braun, Tristan; Fischer, Julian; Frick, Stefan; Nauerth, Sebastian; Schneider, Christian; Vest, Gwenaelle; Reitzenstein, Stephan; Kamp, Martin; Forchel, Alfred; Höfling, Sven und Weinfurter, Harald (2014): Free space quantum key distribution over 500 meters using electrically driven quantum dot single-photon sources-a proof of principle experiment. In: New Journal of Physics, Bd. 16, 043003

Abstract

Highly efficient single-photon sources (SPS) can increase the secure key rate of quantum key distribution (QKD) systems compared to conventional attenuated laser systems. Here we report on a free space QKD test using an electrically driven quantum dot single-photon source (QD SPS) that does not require a separate laser setup for optical pumping and thus allows for a simple and compact SPS QKD system. We describe its implementation in our 500 m free space QKD system in downtown Munich. Emulating a BB84 protocol operating at a repetition rate of 125 MHz, we could achieve sifted key rates of 5-17 kHz with error ratios of 6-9 and g((2))(0)-values of 0.39-0.76.

• Dokumententyp: Zeitschriftenartikel
• Publikationsform: Publisher's Version
• Keywords: QKD;quantum key distribution; quantum dots;electrically driven; free space
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 1367-2630
• Sprache: Englisch