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, Sven Hoefling, Harald Weinfurter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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.

Original languageEnglish
Article number043003
Number of pages10
JournalNew Journal of Physics
Volume16
DOIs
Publication statusPublished - 7 Apr 2014

Keywords

  • QKD
  • Quantum key distribution
  • Quantum dots
  • Electrically driven
  • Free space

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