Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.24: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik
Quantum Key Distribution with Small Satellites — •Peter Freiwang3, Wenjamin Rosenfeld3, Harald Weinfurter3, 5, and Qube Consortium1, 2, 3, 4, 6 — 1Center for Telematics (ZfT), Würzburg, Germany — 2German Aerospace Center (DLR) IKN, Oberpfaffenhofen, Germany — 3Ludwig-Maximilian-University (LMU), Munich, Germany — 4Max Planck Institute for the Science of Light (MPL), Erlangen, Germany — 5Max Planck Institute of Quantum Optics (MPQ), Garching, Germany — 6OHB System AG, Oberpfaffenhofen, Germany
QKD to satellites can enable global secure communication. After the first successful demonstration by the Chinese satellite MICIUS, the question arises how small a satellite can be designed. We show our concept for a BB84 QKD payload for the nano-satellite mission QUBE. Faint laser pulses from four VCSELs at 850 nm are polarized using an array of polarizer foils and focused into a waveguide chip, which couples the four input modes into a single mode fiber. The optical QKD-unit will be hermetically sealed and mounted onto a 9x9 cm2 PCB. Together with a second quantum payload to evaluate CV-QKD and quantum random number generation, this mission will study the feasibility of cost effective QKD with nano-satellites in low-earth-orbits (∼ 500 km altitude). In the first phase, the satellite with a planned size of only 30x10x10 cm3 will use an optical terminal (OSIRIS - Optical Space Infrared Downlink System) with an aperture of 20 mm for downlink to the optical ground station with a planned telescope size of 80 cm to achieve high coupling efficiency.