Physicists take a perverse pleasure in playing with the strangeness of the quantum world. That's how they have managed to entangle minuscule objects such as photons. After specific manipulations, they persuade two photons to act as a single entity, even though they are separated by several kilometers. A breakthrough has just been made in this endeavor since a team from the University of Geneva has succeeded in entangling not minuscule objects, but macroscopic crystals.
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