Witnessing multipartite entanglement by detecting asymmetry

TL;DR

This paper proposes an experimental method to detect multipartite entanglement in many-body quantum systems by measuring asymmetry relative to a Hamiltonian, demonstrated through simulations on a three-qubit state.

Contribution

It introduces a novel approach linking quantum coherence asymmetry to entanglement detection, enabling experimental witnessing of multipartite entanglement.

Findings

Successful simulation of asymmetry and entanglement detection

Demonstrated method applicable to three-qubit GHZ-diagonal states

Provides a new tool for experimental quantum information processing

Abstract

The characterization of quantum coherence in the context of quantum information theory and its interplay with quantum correlations is currently subject of intense study. Coherence in an Hamiltonian eigenbasis yields asymmetry, the ability of a quantum system to break a dynamical symmetry generated by the Hamiltonian. We here propose an experimental strategy to witness multipartite entanglement in many-body systems by evaluating the asymmetry with respect to an additive Hamiltonian. We test our scheme by simulating asymmetry and entanglement detection in a three-qubit GHZ-diagonal state.