In the last decade, it was understood that quantum networks involving several independent sources of entanglement which are distributed and measured by several parties allowed for completely novel forms of nonclassical quantum correlations, when entangled measurements are performed. Here, we experimentally obtain quantum correlations in a triangle network structure, and provide solid evidence of its nonlocality. Specifically, we first obtain the elegant distribution proposed in (Entropy 21, 325) by performing a six-photon experiment. Then, we justify its nonlocality based on machine learning tools to estimate the distance of the experimentally obtained correlation to the local set, and through the violation of a family of conjectured inequalities tailored for the triangle network.
@article{arxiv.2401.15428,
title = {Experimental genuine quantum nonlocality in the triangle network},
author = {Ning-Ning Wang and Chao Zhang and Huan Cao and Kai Xu and Bi-Heng Liu and Yun-Feng Huang and Chuan-Feng Li and Guang-Can Guo and Nicolas Gisin and Tamás Kriváchy and Marc-Olivier Renou},
journal= {arXiv preprint arXiv:2401.15428},
year = {2024}
}