Scaling up the Einstein-Podolsky-Rosen paradox with massive tests.

Physicists at the University of Basel have shown that the Einstein-Podolsky-Rosen paradox still holds even when scaled up to a larger system using Bose-Einstein condensates. The experiment involved generating a cloud of rubidium-87 atoms, forcing them to become an entangled Bose-Einstein condensate, and then releasing the condensate into two separate clouds where the pseudospins were entangled. The properties of the two clouds could not be correlated in a way attributable to chance, suggesting that the EPR paradox holds even when scaled up. The experiment could serve as a template for conducting other quantum metrology applications.