Universal nonlinear entanglement witnesses

TL;DR

This paper introduces a universal method for creating nonlinear entanglement witnesses that can detect quantum correlations in various systems, expressed through measurable observables, applicable to any number of particles.

Contribution

It provides a general recipe for constructing nonlinear entanglement witnesses applicable to diverse quantum systems, enhancing experimental detection capabilities.

Findings

Constructed witnesses are expressed in terms of measurable expectation values.

Applicable to systems of distinguishable and identical particles.

Works for arbitrary number of constituents.

Abstract

We give a universal recipe for constructing nonlinear entanglement witnesses able to detect non-classical correlations in arbitrary systems of distinguishable and/or identical particles for an arbitrary number of constituents. The constructed witnesses are expressed in terms of expectation values of observables. As such they are, at least in principle, measurable in experiments