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

• URL: http://arxiv.org/abs/2111.06747v1
• Date: Fri, 12 Nov 2021 14:47:23 GMT
• Title: Analysis of satellite-to-ground quantum key distribution with adaptive optics
• Authors: Valentina Marulanda Acosta, Daniele Dequal, Matteo Schiavon, Aur\'elie Montmerle-Bonnefois, Caroline B. Lim, Jean-Marc Conan and Eleni Diamanti
• Abstract summary: Future quantum communication infrastructures will rely on both terrestrial and space-based links. We study the role of adaptive optics (AO) in this optimization.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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