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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.27: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Towards continuous-variable quantum key distribution at GHz rates — Imran Khan^1,2, •Birgit Stiller^1,2, Kevin Jaksch^1,2, Nitin Jain^1,2, Tobias Röthlingshöfer^1,2, Christian Peuntinger^1,2, Christoph Marquardt^1,2, and Gerd Leuchs^1,2 — ¹Max 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.