When particles fall left and right at the same time: Physicists develop new method to verify quantum entanglement

It takes only a slight disturbance for a pencil standing on its tip to fall in one direction or another. In the quantum world it is possible in principle for particles of a system to fall both left and right at the same time. Differentiating this "and" state -- the quantum entanglement of particles -- from the classical "or" is an experimental challenge. Scientists have now devised a novel and universal method that enables entanglement verification for states of large atomic systems.

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