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On the Einstein-Podolsky-Rosen Paradox**Dedicated to my colleague and friend Giuseppe Del Re - for whom imagination and ideas have always been more precious than computations - on the occasion of his 65th birthday

Elsevier Science & Technology
DOI: 10.1016/s0065-3276(08)60492-x
  • Physics


Central to the EPR paradox is a ‘thought experiment’ in which two spins are initially coupled to a state with S = 0 and are then separated to a large distance, at which they can be separately observed. Quantum mechanics apparently predicts that the two spins remain forever coupled, but this conflicts with Einstein's principle of ‘locality’ or ‘separability’, according to which spatially well separated systems must be independent, no matter how strongly they have interacted in the past. It is now widely held that Einstein was wrong and that ‘non-locality’ follows inevitably from quantum mechanics i.e. that even distant systems are never truly separable.

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