In the most massive test to date, physicists have probed a major paradox in quantum mechanics and found it still holds even for clouds of hundreds of atoms.

Using two entangled Bose-Einstein condensates, each consisting of 700 atoms, a team of physicists co-led by Paolo Colciaghi and Yifan Li of the University of Basel in Switzerland has shown that the Einstein-Podolsky-Rosen (EPR) paradox scales up.

The researchers say this has important implications for quantum metrology – the study of measuring things under quantum theory.

"Our results represent the first observation of the EPR paradox with spatially separated, massive many-particle systems," the researchers write in their paper.

"They show that the conflict between quantum mechanics and local realism does not disappear as the system size increases to more than a thousand massive particles."

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