Quantum entanglement in a many-particle system - a first

ack

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This is serious advancement in quantum physics and Einstein's "spooky action at a distance", involving more than just single atoms

The experiment used lasers to cool atoms to just a few billionths of a degree above absolute zero. At these temperatures, the atoms behave entirely according to the laws of quantum mechanics and form what is known as a Bose-Einstein condensate—a state of matter that Einstein predicted in another pioneering paper in 1925. In this ultracold cloud, the atoms constantly collide with one another, causing their spins to become entangled.

The researchers then took measurements of the spin in spatially separated regions of the condensate. Thanks to high-resolution imaging, they were able to measure the spin correlations between the separate regions directly and, at the same time, to localize the atoms in precisely defined positions. With their experiment, the researchers succeeded in using measurements in a given region to predict the results for another region.

"The results of the measurements in the two regions were so strongly correlated that they allowed us to demonstrate the EPR paradox," says Ph.D. student Matteo Fadel, lead author of the study. "It's fascinating to observe such a fundamental phenomenon of quantum physics in ever larger systems. At the same time, our experiments establish a link between two of Einstein's most important works."

https://phys.org/news/2018-04-einstein-podolsky-rosen-paradox-many-particle.html
 

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