We use hyper-entanglement to experimentally realize deterministic entanglement swapping based on quantum Elegant Joint Measurements. These are joint projections of two qubits onto highly symmetric, iso-entangled, bases. We report measurement fidelities no smaller than 97.4%. We showcase the applications of these measurements by using the entanglement swapping procedure to demonstrate quantum correlations in the form of proof-of-principle violations of both bilocal Bell inequalities and more stringent correlation criteria corresponding to full network nonlocality. Our results are a foray into entangled measurements and nonlocality beyond the paradigmatic Bell state measurement and they show the relevance of more general measurements in entanglement swapping scenarios.
@article{arxiv.2203.16207,
title = {Entanglement swapping and quantum correlations via Elegant Joint Measurements},
author = {Cen-Xiao Huang and Xiao-Min Hu and Yu Guo and Chao Zhang and Bi-Heng Liu and Yun-Feng Huang and Chuan-Feng Li and Guang-Can Guo and Nicolas Gisin and Cyril Branciard and Armin Tavakoli},
journal= {arXiv preprint arXiv:2203.16207},
year = {2022}
}