Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Quantum Communication II
Q 9.7: Vortrag
Montag, 6. März 2017, 18:30–18:45, P 3
Quantum-Limited Measurements of Optical Signals from a Geostationary Satellite — •Kevin Günthner1,2, Imran Khan1,2, Dominique Elser1,2, Birgit Stiller1,2, Ömer Bayraktar1,2, Christian R. Müller1,2, Karen Saucke3, Daniel Tröndle3, Frank Heine3, Stefan Seel3, Peter Greulich3, Herwig Zech3, Björn Gütlich4, Ines Richter4, Sabine Philipp-May4, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany. — 2Department of Physics, University of Erlangen-Nuremberg (FAU), Germany. — 3Tesat-Spacecom GmbH & Co. KG, Backnang, Germany. — 4German Aerospace Center (DLR), Space Administration, Bonn, Germany.
Quantum key distribution protocols have already been implemented in metropolitan networks all around the world. A promising method to provide the still missing long-haul link between such networks is optical satellite communication. To this end, existing Laser Communication Terminals (LCTs) can be upgraded to be suitable for quantum communication. An important step towards this objective is to precisely characterize the quantum noise behaviour of the system including the channel. We have performed quantum-limited measurements of optical signals from the Alphasat TDP1 LCT in geostationary Earth orbit. We show that quantum coherence is preserved after propagation of the quantum states over 38600 km. An upper bound for the excess noise that the states could have acquired after propagation is estimated [1].
[1] K. Günthner, I. Khan et al., arXiv:1608.03511 (2016).