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Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.27: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Towards continuous-variable quantum key distribution at GHz ratesImran Khan1,2, •Birgit Stiller1,2, Kevin Jaksch1,2, Nitin Jain1,2, Tobias Röthlingshöfer1,2, Christian Peuntinger1,2, Christoph Marquardt1,2, and Gerd Leuchs1,21Max Planck Institute for the Science of Light, Guenther-Scharowsky-Str. 1/Bldg. 24, D-91058 Erlangen, Germany — 2Institute for Optics, Information and Photonics, University of Erlangen-Nuernberg, Staudtstraße 7/B2, 91058 Erlangen, Germany

The ability to securely distribute keys at high rates is of crucial importance for the future of practical quantum key distribution (QKD). In state-of-the-art continuous-variable (CV) implementations, these rates are limited by the bandwidth of the detectors. With recent publications showing shot-noise limited homodyne detectors in the GHz regime, CV-QKD with GHz rates may soon be a reality. In our work, we analyze how this high speed regime might impact current experimental setups in fiber and free space and discuss possible improvements.

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