# Dynamical creation and detection of entangled many-body states in a chiral atom chain

## TL;DR

This paper presents a method to detect and analyze entangled many-body states in chiral atom chains by monitoring emitted photons, enabling insights into complex quantum phases and dynamical behaviors relevant for current experimental setups.

## Contribution

It introduces a photon monitoring technique to identify dark entangled states and probe dynamical phenomena in chiral light-matter systems, advancing experimental characterization methods.

## Key findings

- Detection of dark entangled states via photon emission records
- Observation of coexistence of dark entangled and mixed phases
- Framework applicable to current experimental platforms

## Abstract

Open quantum systems with chiral interactions can be realized by coupling atoms to guided radiation modes in waveguides or optical fibres. In their steady state these systems can feature intricate many-body phases such as entangled dark states, but their detection and characterization remains a challenge. Here we show how such collective phenomena can be uncovered through monitoring the record of photons emitted into the guided modes. This permits the identification of dark entangled states but furthermore offers novel capabilities for probing complex dynamical behavior, such as the coexistence of a dark entangled and a mixed phase. Our results are of direct relevance for current experiments, as they provide a framework for probing, characterizing and classifying dynamical features of chiral light-matter systems.