Clouds of atoms, vibrating mirrors show their quantum side

From Ars Technica

Enlarge / A Bose-Einstein condensate of rubidium atoms forms. Similar clouds of atoms were used to study entanglement.

To say the quantum world is unintuitive is a staggering understatement. Particles end up in more than one place at a time, and the instances interact with each other. Decisions made after a photon has traversed an obstacle course determine the path it took through it. Entangled quantum objects can be in separate galaxies, yet measuring one will instantly set the fate of the second. Obviously, things like this don’t take place in the world of our common experience.

So where’s the boundary that separates the quantum world from ours? While the experiments above were first demonstrated with individual particles, researchers have revisited some of them with ever-larger objects, showing that entire molecules will act just like an electron does. Now, the limit’s been pushed back even further, as a collection of papers describes the entanglement of…

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