A neat experiment shows that the mechanical vibration of two ion pairs separated by a few hundred micrometres is entangled — their motions are intrinsically and inseparably connected in a quantum way.
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Blatt, R. Entanglement goes mechanical. Nature 459, 653–654 (2009). https://doi.org/10.1038/459653a
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DOI: https://doi.org/10.1038/459653a
