Detecting multilevel entanglement from light-based entanglement witnesses

TL;DR

This paper presents electric-field based inequalities that effectively detect multilevel entanglement in systems of quantum emitters, enhancing entanglement detection capabilities in complex quantum states.

Contribution

It introduces novel inequalities for detecting multilevel entanglement that are robust, noise-tolerant, and applicable without local measurements in various quantum systems.

Findings

Efficient detection of genuine multipartite entanglement in quantum states.

Detection method is robust to noise and applicable to mixed states.

Detection can be enhanced by polarization and detection direction.

Abstract

We introduce a set of electric-field based inequalities capable of detecting multilevel entanglement from a system of N quantum emitters. We determine that the polarization channel as well as the direction of detection can enhance entanglement detection, a feature specific to multilevel systems. We demonstrate the efficiency of the witnesses to detect genuine multipartite entanglement by applying it to families of paradigmatic quantum states, such as Dicke states, singlet states and W-like states. The detection is not only robust to noise, but also applies to mixed entangled states. Our findings open up possibilities for the detection of entanglement without local measurements in systems of multilevel emitters such as superconducting qubits, Rydberg atoms or quantum dots.