Mermin, N. David, "Extreme Quantum Entanglement in a Superposition of Macroscopically Distinct States," Physical Review Letters, V65, 15 (1990)

A Bell inequality is derived for a state of n spin-1/2 particles which superposes two macroscopically distinct states. Quantum mechanics violates this inequality by an amount that grows exponentially with n.

The Bell-inequality is a measure of the difference in correlation structure of the classical and quantum descriptions. The first examples (Bell, 1964) involved only two-particle systems - even in this case the richness of the correlation in the quantum de scription exceeded that of any scenarios in the classical, localized description. Mermin has shown that this measure of the difference between the systems grown expentially with the number of particle in the entangled state. (Here is a little thread wherein N.D. Mermin comments on his result...)

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EPR Bell's theorem Kochen and Specker GHZ Mermin

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Nonlocality