# Quantum channels from reflections on moving mirrors

## TL;DR

This paper investigates the quantum channels generated by light reflection on an accelerating mirror, revealing a transition from amplifier to lossy to classical and erasure channels depending on frequency, with implications for quantum communication.

## Contribution

It introduces a detailed analysis of quantum channels from moving mirrors, identifying different regimes and their characteristics based on mirror acceleration and frequency.

## Key findings

- Identifies quantum amplifier and lossy channels depending on frequency.
- Finds a classical additive channel at the threshold frequency.
- Shows the channel becomes an erasure channel at high frequencies.

## Abstract

Light reflection on a mirror can be thought as a simple physical effect. However if this happens when the mirror moves a rich scenario opens up. Here we aim at analyzing it from a quantum communication perspective. In particular, we study the kind of quantum channel that arises from (Gaussian) light reflection upon an accelerating mirror. Two competing mechanisms emerge in such a context, namely photons production by the mirror's motion and {\blu interference between modes}. As consequence we find out a quantum amplifier channel and quantum lossy channel respectively below and above a threshold frequency (that depends on parameters determining mirror's acceleration). Exactly at the threshold frequency the channel behaves like a purely classical additive channel, while it becomes purely erasure for large frequencies. In addition the time behavior of the channel is analyzed by employing wave packets expansion of the light field.