# Spatial Multiplexing in a Cavity-Enhanced Quantum Memory

## TL;DR

This paper proposes a multiplexed quantum repeater protocol using a cavity-enhanced ensemble of rubidium atoms, demonstrating potential for efficient long-distance quantum entanglement and networking.

## Contribution

It introduces a novel multiplexed quantum repeater scheme utilizing spatially multiplexed spinwaves in a cavity-atom system, advancing quantum communication technology.

## Key findings

- Calculated entanglement rates over long distances are promising.
- Demonstrated strong collective coupling in a cavity with rubidium atoms.
- Constructed a multiplexing apparatus with a 2D acousto-optical deflector.

## Abstract

We present a multiplexed quantum repeater protocol based on an ensemble of laser-cooled and trapped rubidium atoms inside an optical ring cavity. We have already demonstrated strong collective coupling in such a system and have constructed a multiplexing apparatus based on a two-dimensional acousto-optical deflector. Here, we show how this system could enable a multiplexed quantum repeater using collective excitations with non-trivial spatial phase profiles (spinwaves). Calculated entanglement generation rates over long distances reveal that such a multiplexed ensemble-cavity platform is a promising route towards long distance quantum entanglement and networking.