Device-Independent Test for Genuine Multipartite Entanglement

TL;DR

This paper presents a measurement-device-independent method to detect genuine multipartite entanglement with high probability, even without detailed knowledge of the state preparation, decoherence, or detection processes.

Contribution

It introduces a novel approach for detecting GME that does not rely on device calibration or state tomography, enhancing security and feasibility in quantum information tasks.

Findings

GME can be detected with high probability without detailed device knowledge

The method is applicable when state tomography is infeasible

It provides a tool for security analysis in quantum cryptography

Abstract

We investigate a-priori detection probabilities of genuine multipartite entanglement (GME). Even if one does not have knowledge about the basis in which a state is produced by a source, how a channel decoheres it or about the very working of the detectors used, we find that it is possible to detect GME with reasonably high probability in a feasible fashion. We show that by means of certain separability criteria, GME can be detected in a measurement-device-independent way. Our method provides several applications whenever e.g. state tomography is not possible or too demanding, and is a tool to investigate security issues in multi-particle quantum cryptographical protocols.