What does this research mean for the field?

An end-to-end, time-evolving simulation model demonstrates that optimized satellite-to-ground quantum key distribution can achieve continuous day-and-night operation under favorable weather conditions, despite limited daytime link margins. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Develop an end-to-end, time-evolving simulation model to capture instantaneous channel loss and finite-size secret key rates in satellite-to-ground quantum communications.

September 10, 2026npj Quantum InformationOpen Access

Satellite-to-ground quantum key distribution model under time-evolving turbulence

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Authors

HFHaiyang FuUniversity of Science and Technology of China FWFang‐Xiang WangUniversity of Science and Technology of China SWShuang WangUniversity of Science and Technology of China

Discussion

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Implication

Simulation study demonstrates continuous day-and-night quantum key distribution in geostationary satellite links, highlighting the critical role of adaptive optics under time-evolving turbulence.

Key Points

Develop an end-to-end, time-evolving simulation model to capture instantaneous channel loss and finite-size secret key rates in satellite-to-ground quantum communications.
Integrated a dynamic phase-screen turbulence model into physical link stages, including beam propagation, spatial tracking, adaptive-optics correction, and single-mode fiber coupling.
Calculated time-dependent channel loss and background thermal noise to estimate finite-size secret key rates and assess mitigation strategies for a geostationary link.
Optimized system configurations sustained continuous day-and-night quantum key distribution under favorable atmospheric conditions.
Daytime operation exhibited a substantially constrained link margin relative to nighttime transmission due to ambient background noise and turbulence-induced coupling loss.

Cite This Study

Fu et al. (2026) studied this question.

synapsesocial.com/papers/6aa27b3558559d80afc7451f https://doi.org/10.1038/s41534-026-01363-3

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Implication

Simulation study demonstrates continuous day-and-night quantum key distribution in geostationary satellite links, highlighting the critical role of adaptive optics under time-evolving turbulence.