Efficient device-independent entanglement detection for multipartite systems

TL;DR

This paper presents a scalable, device-independent method for detecting entanglement in large multipartite quantum systems, requiring minimal measurement information and suitable for experimental use.

Contribution

It introduces a novel entanglement detection technique that scales efficiently, needs limited measurement data, and is based on nonlocality detection, advancing practical quantum information applications.

Findings

Efficient detection in systems with up to tens of particles

Requires only a subset of measurements, suitable for experiments

Demonstrated on well-known multipartite states

Abstract

Entanglement is one of the most studied properties of quantum mechanics for its application in quantum information protocols. Nevertheless, detecting the presence of entanglement in large multipartite sates continues to be a great challenge both from the theoretical and the experimental point of view. Most of the known methods either have computational costs that scale inefficiently with the number of particles or require more information on the state than what is attainable in everyday experiments. We introduce a new technique for entanglement detection that provides several important advantages in these respects. First, it scales efficiently with the number of particles, thus allowing for application to systems composed by up to few tens of particles. Second, it needs only the knowledge of a subset of all possible measurements on the state, therefore being apt for experimental implementation. Moreover, since it is based on the detection of nonlocality, our method is device independent. We report several examples of its implementation for well-known multipartite states, showing that the introduced technique has a promising range of applications.