Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.41: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Free-space quantum key distribution at a wavelength of 10.6 μm using continuous variables — •Kevin Jaksch1,2, Imran Khan1,2, Tobias Frank1,2, Jonas Geyer-Ramsteck1,2, Christian Peuntinger1,2, Birgit Stiller1,2,3, Ulrich Vogl1,2, Dominique Elser1,2, Christoph Marquardt1,2, and Gerd Leuchs1,2,4 — 1Max Planck Institute for the Science of Light Erlangen, Germany — 2Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Germany — 3Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney, NSW 2006, Australia — 4Department of Physics, University of Ottawa, 25 Templeton, Ottawa, ON, Canada
A beam of light, transmitted through the atmosphere, is scattered by atmospheric particles. If the wavelength is much larger than the particle size, these losses are significantly reduced. We propose a novel free-space quantum key distribution (QKD) system operating at a wavelength of 10.6 μm (which is much larger than the size of a water droplet under hazy conditions) in the continuous-variable domain. We plan to use the polarization degree of freedom to encode quantum states and continuous-variable Stokes detection as a measurement scheme. This measurement benefits from a higher detection efficiency than direct detection and acts as a narrowband filter against backround noise sources. We study the feasibility of this wavelength for atmospheric quantum communication, considering beam propagation effects and the performance of the available technology. Note, that there are no single-photon detectors available at this wavelength.