Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.51: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Quantum Key Distribution with Small Satellites — •Peter Freiwang3, Lukas Knips3, 5, Leonhard Mayr3, Wenjamin Rosenfeld3, QUBE consortium1, 2, 3, 4, 6, and Harald Weinfurter3, 5 — 1Center for Telematics (ZfT), Würzburg — 2German Aerospace Center (DLR) IKN, Oberpfaffenhofen — 3Ludwig-Maximilian-University (LMU), Munich — 4Max Planck Institute for the Science of Light (MPL), Erlangen — 5Max Planck Institute of Quantum Optics (MPQ), Garching — 6OHB System AG, Oberpfaffenhofen
Future global secure communication networks will rely on QKD with satellites. After the first successful demonstration by the Chinese satellite MICIUS, the question arises how small a satellite can be designed. We report on the progress to build 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 QKD optics which will be mounted onto a 9x9 cm2 PCB well suites as small and robust unit for the cube-satellite system. Together with a second quantum payload for 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 is equiped with an optical terminal (OSIRIS, aperture 20 mm) for the downlink to the optical ground station (Ø 80 cm) and will allow important tests of space capable QKD hardware.