Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 9: Quantum Communication II

Q 9.8: Talk

Monday, March 6, 2017, 18:45–19:00, P 3

Progress on continuous-variable high-speed quantum key distribution compatible with telecom networks — Imran Khan^{1, 2}, Birgit Stiller^{1, 2, 3}, Ulrich Vogl¹, •Stefan Richter^{1, 2}, Kevin Jaksch^{1, 2}, Kevin Günthner^{1, 2}, Christian Peuntinger^{1, 2, 4}, Dominique Elser^{1, 2}, Christoph Pacher⁵, Christoph Marquardt^{1, 2}, and Gerd Leuchs^{1, 2, 6} — ¹Max Planck Institute for the Science of Light, Staudtstraße 2, 91058 Erlangen, Germany — ²IOIP, Friedrich-Alexander University Erlangen-Nuremberg (FAU), Staudtstr. 7/B2, 91058 Erlangen, Germany — ³Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), School of Physics, The University of Sydney, NSW 2006, Australia — ⁴Department of Physics, University of Otago, 730 Cumberland Street, Dunedin, New Zealand — ⁵AIT Austrian Institute of Technology, Donau-City-Strasse 1, 1220 Vienna, Austria — ⁶Department of Physics, University of Ottawa, 25 Templeton, Ottawa, ON, Canada

For efficient and practical quantum key distribution (QKD), high key rates and compatibility with existing communications infrastructure are important aspects. This work shows the recent progress of our group in Erlangen on the implementation of a continuous-variable QKD setup achieving GHz transmission rates in a telecom fiber environment. We discuss the challenges of employing modulation schemes like quadrature phase-shift keying (QPSK) and Gaussian-modulated coherent states (GMCS). We also demonstrate the experimental feasibility of these schemes for our setup using optical heterodyne detection in the GHz regime.