Detection of entanglement in ultracold lattice gases

TL;DR

This paper introduces a non-destructive quantum polarization spectroscopy method to detect and analyze multi-particle entanglement in ultracold lattice gases, enabling phase diagram reconstruction and entanglement detection.

Contribution

It presents a novel light-matter interface technique based on the quantum Faraday effect for measuring entanglement in ultracold atoms in optical lattices.

Findings

Successfully reconstructs phase diagrams from light signals.

Demonstrates detection of quantum many-body entanglement.

Provides a feasible experimental approach for entanglement detection.

Abstract

We propose the use of quantum polarization spectroscopy for detecting multi-particle entanglement of ultracold atoms in optical lattices. This method, based on a light-matter interface employing the quantum Farady effect, allows for the non destructive measurement of spin-spin correlations. We apply it to the specific example of a one dimensional spin chain and reconstruct its phase diagram using the light signal, readily measurable in experiments with ultracold atoms. Interestingly, the same technique can be extended to detect quantum many-body entanglement in such systems.