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

Markus Rau, Tobias Heindel, Sebastian Unsleber, Tristan Braun, Julian Fischer, Stefan Frick, Sebastian Nauerth, Christian Schneider, Gwenaelle Vest, Stephan Reitzenstein, Martin Kamp, Alfred Forchel (+2 others)
2014 New Journal of Physics  
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
more » ... n 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 (0) (2) -values of 0.39-0.76.
doi:10.1088/1367-2630/16/4/043003 fatcat:x52initkoraf3f4tlddmyyhxca