Experimental Multipartite Entanglement Detection With Minimal-Size Correlations

TL;DR

This paper demonstrates an experimental method for detecting multipartite entanglement using minimal-size correlations, making it more robust and feasible for large-scale quantum systems where traditional methods fail.

Contribution

First experimental demonstration of multipartite entanglement detection with minimal-size correlations, enhancing robustness and scalability.

Findings

Robustness to measurement misalignment

Successful certification of genuine multipartite entanglement

Effective detection in large-scale entangled states

Abstract

Multiparticle entanglement is a valuable resource for quantum technologies, including measurement based quantum computing, quantum secret sharing, and a variety of quantum sensing applications. The direct way to detect this resource is to observe correlations arising from local measurements performed simultaneously on all particles. However, this approach is increasingly vulnerable to measurement imperfections when the number of particles grows, and becomes unfeasible for large-scale entangled states. It is therefore crucial to devise detection methods that minimize the number of simultaneously measured particles. Here we provide the first experimental demonstration of multipartite entanglement detection with minimal-size correlations, showing that our setup is robust to misalignment of the local measurement bases and enables the certification of genuine multipartite entanglement in a regime where the direct approach fails. Overall, our results indicate a promising route to the experimental detection of genuine multipartite entanglement in large-scale entangled states.