# Satellite-based links for Quantum Key Distribution: beam effects and weather dependence

## TL;DR

This paper develops a detailed model for atmospheric losses affecting satellite-based quantum communication links and analyzes the performance of various QKD implementations under different weather conditions.

## Contribution

It provides a comprehensive atmospheric loss model and evaluates QKD performance considering finite-key effects for practical satellite communication scenarios.

## Key findings

- Weather significantly impacts quantum signal transmission.
- Finite-key effects influence QKD protocol performance.
- The model enables more accurate feasibility assessments for satellite QKD.

## Abstract

The establishment of a world-wide quantum communication network relies on the synergistic integration of satellite-based links and fiber-based networks. The first are helpful for long-distance communication, as the photon losses introduced by the optical fibers are too detrimental for lengths greater than about 200 km. This work aims at giving, on the one hand, a comprehensive and fundamental model for the losses suffered by the quantum signals during the propagation along an atmospheric free-space link. On the other hand, a performance analysis of different Quantum Key Distribution (QKD) implementations is performed, including finite-key effects, focusing on different interesting practical scenarios. The specific approach that we chose allows to precisely model the contribution due to different weather conditions, paving the way towards more accurate feasibility studies of satellite-based QKD missions.