# Quantum teleportation through atmospheric channels

## TL;DR

This paper investigates the feasibility and optimization of continuous-variable quantum teleportation over atmospheric channels, analyzing entanglement preservation, adaptive loss correlations, and postselection strategies under turbulence effects.

## Contribution

It introduces realistic models for atmospheric turbulence effects on quantum teleportation and evaluates strategies to optimize fidelity and entanglement preservation.

## Key findings

- Optimal squeezing parameter is limited by realistic atmospheric conditions.
- Adaptive correlation techniques improve teleportation fidelity in turbulent channels.
- Postselection strategies depend on stochastic channel transmittance properties.

## Abstract

We study the Kimble-Braunstein continuous-variable quantum teleportation with the quantum channel physically realized in the turbulent atmosphere. In this context, we examine the applicability of different strategies preserving the Gaussian entanglement [Bohmann et al., Phys. Rev. A 94, 010302(R) (2016)] for improving the fidelity of the coherent-state teleportation. First, we demonstrate that increasing the squeezing parameter characterizing the entangled state is restricted by its optimal value, which we derive for realistic experimentally-verified examples. Further, we consider the technique of adaptive correlations of losses and show its performance for channels with large squeezing parameters. Finally, we investigate the efficiencies of postselection strategies in dependence on the stochastic properties of the channel transmittance.