What is realism and how can it be non-local?

Details What is realism and how can it be non-local? What is realism and how can it be non-local?

2009-03-29

arxiv.org/abs/0903.4974v2

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

The quantum theory predictions about entanglements contradict the assumptions of realism and locality when these two are taken together, the so-called non-local realism. Groblacher et al. took one step further and examined the concept of realism while admitting that entangled quantum systems are influenced not only by local parameters but also by distant parameters. Groblacher et al. called that non-local realism and tried to prove that it is still contradicted by the quantum theory.The present text analyses the consistency of the concept of non-local realism, before questioning whether the experiment contradicts it or not. The realism supposes that macroscopic apparatuses don't enforce one result or another in measurements, but only reveal pre-existent values of properties of the measured systems. However, it is shown here that if factors situated at a distance from a system are assumed to influence the system response to measurements, the wave function may be not unique. It's the macroscopic objects that pick one wave function from the different possible wave functions. So, their influence on the results cannot be denied s.t. the realism is not tenable.

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