Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 45: Quantum Information (Quantum Communication) II

Q 45.4: Vortrag

Donnerstag, 14. März 2019, 11:15–11:30, S HS 002 Chemie

Satellite-based links for Quantum Key Distribution: beam effects and weather dependence — •Carlo Liorni, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich Heine Universität, Universitätstr. 1, Düsseldorf 40225, Germany

The establishment of a world-wide quantum communication network relies on the synergistic integration of satellite-based links and fiber-based networks.

Optical satellite links have the drawback of being strongly dependent on the weather conditions. The presence of turbulent eddies and scattering particles like haze or fog induce random deviations and deformations of the optical beam. In this work we generalize a recently proposed approach [D. Vasylyev et al., PRA 96, 043856] to satellite-based links, taking into account both phenomena. We analytically compute the beam parameters at the receiver and the correspondent Probability Distribution of the Transmittance (PDT), depending on the weather conditions.

The expected transmittance of the link is then used to study the performances of the polarization-based BB-84 cryptographic protocol in different real-life scenarios and configurations (Up- and Down-links). The model presented here supports the analysis of new protocols or proposals for future satellite missions.