Physics – Quantum Physics
Scientific paper
2009-03-12
New Journal of Physics 11, 045017 (2009)
Physics
Quantum Physics
23 pages, 17 figures
Scientific paper
In this paper we present a novel analysis of the feasibility of quantum key distribution between a LEO satellite and a ground station. First of all, we study signal propagation through a turbulent atmosphere for uplinks and downlinks, discussing the contribution of beam spreading and beam wandering. Then we introduce a model for the background noise of the channel during night-time and day-time, calculating the signal-to-noise ratio for different configurations. We also discuss the expected error-rate due to imperfect polarization-compensation in the channel. Finally, we calculate the expected key generation rate of a secure key for different configurations (uplink, downlink) and for different protocols (BB84 with and without decoy states, entanglement-based Ekert91 protocol).
Bonato Cristian
Da Deppo Vania
Naletto Giampiero
Tomaello Andrea
Villoresi Paolo
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