  alain aspect (; born 15 june 1947) is a french physicist noted for his experimental work on quantum entanglement. ==biography== aspect is a graduate of the Ãcole normale supÃ©rieure de cachan (ens cachan). he passed the 'agrÃ©gation' in physics in 1969 and received his master's degree from universitÃ© d'orsay. he then did his national service, teaching for three years in cameroon. in the early 1980s, while working on his phd thesiscv from the lesser academic rank of lecturer, he performed the elusive "bell test experiments" that showed that albert einstein, boris podolsky and nathan rosen's reductio ad absurdum of quantum mechanics, namely that it implied 'ghostly action at a distance', did in fact appear to be realised when two particles were separated by an arbitrarily large distance (see epr paradox). a correlation between their wave functions remained, as they were once part of the same wave-function that was not disturbed before one of the child particles was measured. if quantum theory is correct, the determination of an axis direction for the polarization measurement of one photon, forcing the wave function to 'collapse' onto that axis, will influence the measurement of its twin. this influence occurs despite any experimenters not knowing which axes have been chosen by their distant colleagues, and at distances that disallow any communication between the two photons, even at the speed of light. aspect's experiments were considered to provide overwhelming support to the thesis that bell's inequalities are violated in its chsh version. however, his results were not completely conclusive, since there were so-called loopholes that allowed for alternative explanations that comply with 
1947_births French_physicists Living_people Members_of_the_French_Academy_of_Sciences Members_of_the_United_States_National_Academy_of_Sciences Niels_Bohr_Medal_recipients UNESCO_Niels_Bohr_Medal_recipients Wolf_Prize_in_Physics_laureates