# Spin-Wave Multiplexed Atom-Cavity Electrodynamics

## TL;DR

This paper presents a multiplexed atom-cavity quantum electrodynamics system that enables multiple spin-wave excitations with distinct spatial profiles, demonstrating key quantum phenomena and potential for scalable quantum networks.

## Contribution

The work introduces a novel multiplexed atom-cavity setup allowing rapid, interchangeable coupling to numerous spin-wave profiles, advancing quantum information processing capabilities.

## Key findings

- Observation of spin-wave vacuum Rabi splittings
- Demonstration of selective superradiance
- Interference in cavity-mediated spin-wave interactions

## Abstract

We introduce multiplexed atom-cavity quantum electrodynamics with an atomic ensemble coupled to a single optical cavity mode. Multiple Raman dressing beams establish cavity-coupled spin-wave excitations with distinctive spatial profiles. Experimentally, we demonstrate the concept by observing spin-wave vacuum Rabi splittings, selective superradiance, and interference in the cavity-mediated interactions of two spin waves. We highlight that the current experimental configuration allows rapid, interchangeable cavity-coupling to 4 profiles with an overlap parameter of less than 10%, enough to demonstrate, for example, a quantum repeater network simulation in the cavity. With further improvements to the optical multiplexing setup, we infer the ability to access more than $10^3$ independent spin-wave profiles.