Instant Extraction of Non-Perturbative Tripartite Entanglement

TL;DR

This paper demonstrates that tripartite GHZ-type entanglement can be instantaneously extracted from a separable system via local interactions with a scalar field, overcoming bipartite extraction limitations.

Contribution

It provides a non-perturbative analysis showing the feasibility of extracting tripartite entanglement through local interactions, contrasting with bipartite no-go results.

Findings

Tripartite entanglement of GHZ-type can be instantaneously extracted.

Bipartite entanglement extraction is prevented by a no-go theorem.

An optimal coupling strength maximizes entanglement extraction.

Abstract

We consider the problem of extracting tripartite entanglement through single local instantaneous interactions of a separable target system A-B-C with a scalar field. We find, non-perturbatively, that tripartite entanglement is easily extracted in this scenario, in strong contrast to bipartite extraction, which is not possible due to a no-go theorem. The tripartite entanglement is of the GHZ-type, and an optimal value of the coupling exists that admits maximal extraction.