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Progress in satellite quantum key distribution
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DOI：10.1038/s41534-017-0031-5.png)
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摘要
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Quantum key distribution (QKD) is a family of protocols for growing a private encryption key between two parties. Despite much progress, all ground-based QKD approaches have a distance limit due to atmospheric losses or in-fibre attenuation. These limitations make purely ground-based systems impractical for a global distribution network. However, the range of communication may be extended by employing satellites equipped with high-quality optical links. This manuscript summarizes research and development which is beginning to enable QKD with satellites. It includes a discussion of protocols, infrastructure, and the technical challenges involved with implementing such systems, as well as a top level summary of on-going satellite QKD initiatives around the world.
Keyword:
POLARIZATION MEASUREMENTS
ENTANGLED PHOTONS
ATOMIC ENSEMBLES
RADIATION-DAMAGE
CRYPTOGRAPHY
COMMUNICATION
DAYLIGHT
SYSTEM
TRANSMISSION
SECURITY
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