Bell's Theorem - GTech Booster

Bell’s theorem is a fundamental result in quantum mechanics that demonstrates the incompatibility of certain predictions of quantum theory with local hidden-variable theories. It was formulated by physicist John Bell in 1964 and has since been tested and confirmed by various experiments.

The theorem shows that if certain assumptions are satisfied, no local hidden-variable theory can reproduce all the statistical predictions of quantum mechanics. Local hidden-variable theories propose that the behavior of quantum systems is determined by hidden variables that are predetermined and independent of measurement.

Bell’s theorem involves the concept of entanglement, which is a phenomenon where two or more particles become correlated in such a way that the state of one particle cannot be described independently of the state of the other particle, even when they are physically separated.

Ilustration 1

Contents show

Illustration 2

It is a theory

Rule of thumb

The violation of the inequalities in experiments, such as the Aspect experiment mentioned earlier, provides evidence against local hidden-variable theories and supports the non-local nature of quantum entanglement. It suggests that the correlations observed in entangled systems cannot be explained by classical concepts of locality and realism.

The theorem has profound implications for our understanding of the foundations of quantum mechanics and the nature of reality. It has sparked debates and discussions about the interpretation of quantum theory and the philosophical implications of non-locality.