Key generation analysis for satellite quantum key distribution

Sidhu, Jasminder S. and Brougham, Thomas and McArthur, Duncan and Pousa, Roberto G. and Oi, Daniel K. L.; Padgett, Miles J. and Bongs, Kai and Fedrizzi, Alessandro and Politi, Alberto, eds. (2021) Key generation analysis for satellite quantum key distribution. In: Quantum Technology. Proceedings of SPIE - The International Society for Optical Engineering . SPIE, GBR. ISBN 9781510646063 (

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Developing global quantum communication networks is integral to the realisation of the quantum internet, which is expected to impart a similar revolutionary impact on the technological landscape as the classical internet. Satellite-based quantum communications provides a practical route to global quantum networking. In this work, we model finite statistics to determine the finite secret key length generation in SatQKD systems that implement trusted-node downlink operation with weak coherent pulse sources. We optimise the finite key rate for different practical operations and determine the key generation footprints. Our work provides an essential guide for future satellite missions to establish performance benchmarks for both sources and detectors.