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Analysis of satellite-to-ground quantum key distribution with adaptive optics

Abstract : Future quantum communication infrastructures will rely on both terrestrial and space-based links integrating high-performance optical systems engineered for this purpose. In space-based downlinks in particular, the loss budget and the variations in the signal propagation due to atmospheric turbulence effects impose a careful optimization of the coupling of light in single-mode fibers required for interfacing with the receiving stations and the ground networks. In this work, we perform a comprehensive study of the role of adaptive optics (AO) in this optimization, focusing on realistic baseline configurations of prepare-and-measure quantum key distribution (QKD), with both discrete and continuous-variable encoding, and including finite-size effects. Our analysis uses existing experimental turbulence datasets at both day and night time to model the coupled signal statistics following a wavefront distortion correction with AO, and allows us to estimate the secret key rate for a range of critical parameters, such as turbulence strength, satellite altitude and ground telescope diameter. The results we derive illustrate the interest of adopting advanced AO techniques in several practical configurations.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-03434718
Contributor : Caroline B. LIM Connect in order to contact the contributor
Submitted on : Thursday, November 18, 2021 - 1:59:55 PM
Last modification on : Tuesday, January 4, 2022 - 6:44:17 AM

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  • HAL Id : hal-03434718, version 1
  • ARXIV : 2111.06747

Citation

Valentina Marulanda Acosta, Daniele Dequal, Matteo Schiavon, Aurélie Montmerle-Bonnefois, C B Lim, et al.. Analysis of satellite-to-ground quantum key distribution with adaptive optics. 2021. ⟨hal-03434718⟩

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