  Alain Aspect's three experiments on Bell's theorem, published in the early
1980s, were a turning point in the history of the research on the foundations
of quantum mechanics not only because they corroborated entanglement as the
distinctive quantum signature but also because these experiments brought wider
recognition to this field of research and Aspect himself. These experiments may
be considered the most direct precursors of the research on quantum
information, which would blossom a decade later.
