Extreme quantum entanglement in a superposition of macroscopically distinct states
Phys. Rev. Lett. 65, 1838 – Published 8 October, 1990
DOI: https://doi.org/10.1103/PhysRevLett.65.1838
Abstract
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.