Entangled coins

If two entangled coins were flipped, they would land on correlated sides: for example, whenever one landed on heads, the other one would land on tails. This kind of correlation is at the heart of quantum mechanics and cannot usually be seen in macroscopic objects. Now, Hartmann and Plenio have proposed a way to observe this correlation in membranes the size of a pinhead and, therefore, considerably larger than the atoms or photons that are mostly used in entanglement experiments.
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