Free space quantum key distribution over 500 meters using electrically driven quantum dot single-photon sources-a proof of principle experiment
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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.
Rau , M , Heindel , T , Unsleber , S , Braun , T , Fischer , J , Frick , S , Nauerth , S , Schneider , C , Vest , G , Reitzenstein , S , Kamp , M , Forchel , A , Hoefling , S & Weinfurter , H 2014 , ' Free space quantum key distribution over 500 meters using electrically driven quantum dot single-photon sources-a proof of principle experiment ' New Journal of Physics , vol 16 , 043003 . DOI: 10.1088/1367-2630/16/4/043003
New Journal of Physics
© 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 3.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited
The authors gratefully acknowledge expert sample preparation by M Emmerling and A Wolf as well as financial support by the German Ministry of Education and Research through the project QPENS and QUASAR.
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