# Quantum Signaling in Relativistic Motion and Across Acceleration Horizons

## TL;DR

This paper investigates how relativistic motion and acceleration affect quantum communication channels between particle detectors, focusing on classical capacity and optimal detector states in Minkowski spacetime.

## Contribution

It calculates the classical channel capacity for Unruh-DeWitt detectors under relativistic motion and identifies states that maximize signal strength, highlighting relativistic effects on quantum signaling.

## Key findings

- Relativistic effects influence quantum communication capacity.
- Optimal detector states depend on motion and acceleration.
- Acceleration impacts the classical channel capacity in relativistic quantum fields.

## Abstract

The quantum channel between two particle detectors provides a prototype framework for the study of wireless quantum communication via relativistic quantum fields. In this article we calculate the classical channel capacity between two Unruh-DeWitt detectors arising from couplings within the perturbative regime. To this end, we identify the detector states which achieve maximal signal strength. We use these results to investigate the impact of relativistic effects on signaling between detectors in inertial and uniformly accelerated motion which communicate via a massless field in Minkowski spacetime.