On the Einstein-Podolsky-Rosen Paradox*
Roy McWeeny Dipartimento di Chimica e Chimica Industrial Università di Pisa, 56100 Pisa, Italy
Abstract
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. ...
