@article{593, abstract = {Bell correlations, indicating nonlocality in composite quantum systems, were until recently only seen in small systems. Here, we demonstrate Bell correlations in squeezed states of 5×105 Rb87 atoms. The correlations are inferred using collective measurements as witnesses and are statistically significant to 124 standard deviations. The states are both generated and characterized using optical-cavity aided measurements.}, author = {Engelsen, Nils and Krishnakumar, Rajiv and Hosten, Onur and Kasevich, Mark}, journal = {Physical Review Letters}, number = {14}, publisher = {American Physical Society}, title = {{Bell correlations in spin-squeezed states of 500 000 atoms}}, doi = {10.1103/PhysRevLett.118.140401}, volume = {118}, year = {2017}, }