Quantum Entanglement: When Particles Fall Left And Right At The Same Time

In the world we commonly perceive around us, it takes only a slight disturbance for a pencil standing on its tip to fall in one direction or another, but 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  quantum metrology method that enables entanglement verification for states of large atomic systems. read more

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