Abstract
We make a brief historical revision of action-at-a-distance in quantum mechanics. Non-locality has been mostly related to systems of two particles in an entangled state. We show that this effect is also apparent in some experiments with individual particles. An easily performed experiment in this regard is introduced.
Highlights
In the Fifth Solvay Congress (1927) A
The first postulate of orthodox quantum mechanics establishes that the wave function completely describes the state of the system
We should stress the contrast with Einstein analysis in the Fifth Solvay Congress, where he refers to one particle. This difference is crucial to the present study, considering that since the publication of the EPR article non-locality has been mostly associated to systems of particles in entangled states
Summary
In the Fifth Solvay Congress (1927) A. Assuming that the process in terms of Schrödinger waves should be supplemented by some detailed specification of the localization of the particle during its propagation, Einstein succeeded to avoid the notion of action-at-a-distance. The first postulate of orthodox (ordinary or standard) quantum mechanics establishes that the wave function (or state vector) completely describes the state of the system This last theory, called Copenhagen Interpretation, proved stunningly successful [4]. A critical review of these matters has been recently published [5]
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