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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2111.06747 |
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| _version_ | 1866916330542727168 |
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| author | Acosta, Valentina Marulanda Dequal, Daniele Schiavon, Matteo Montmerle-Bonnefois, Aurélie Lim, Caroline B. Conan, Jean-Marc Diamanti, Eleni |
| author_facet | Acosta, Valentina Marulanda Dequal, Daniele Schiavon, Matteo Montmerle-Bonnefois, Aurélie Lim, Caroline B. Conan, Jean-Marc Diamanti, Eleni |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2111_06747 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Analysis of satellite-to-ground quantum key distribution with adaptive optics Acosta, Valentina Marulanda Dequal, Daniele Schiavon, Matteo Montmerle-Bonnefois, Aurélie Lim, Caroline B. Conan, Jean-Marc Diamanti, Eleni Quantum Physics 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. |
| title | Analysis of satellite-to-ground quantum key distribution with adaptive optics |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2111.06747 |