Abstract
In 1935 Albert Einstein together with Boris Podolsky and Nathan Rosen (EPR) published a paper in which they outlined how a ‘proper’ fundamental theory of nature should look like [1]. The EPR programme required completeness (“In a complete theory there is an element corresponding to each element of reality”), locality (“The real factual situation of the system A is independent of what is done with the system B, which is spatially separated from the former”), and defined the element of physical reality as “If, without in any way disturbing a system, we can predict with certainty the value of a physical quantity, then there exists an element of physical reality corresponding to this physical quantity”. EPR then considered a thought experiment on two entangled particles which showed that quantum states cannot in all situations provide a complete description of physical reality.
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