= Alain Aspect
{c}
{tag=Physicist}
{wiki}
= A. Aspect
{c}
{synonym}
<Alain Aspect>, <Jean Dalibard> and <Gérard Roger> tested <Bell inequalities> using pairs of <photons> and rapidly changing polarization analyzers. An acousto-optical switch in each arm routed <light> toward one of two polarizers; switching near $50\,\mathrm{MHz}$ changed the effective setting on a timescale shorter than the <photon> transit time between the analyzers. The measured <correlations> violated the tested <Bell inequality>. These switches were driven at incommensurate frequencies, so their role should be distinguished from the independently randomized settings of later experiments.<Experimental Test of Bell's Inequalities Using Time-Varying Analyzers by Alain Aspect and others>[Abstract and apparatus description, acousto-optical switches and timing]{ref}
A <physicist> researching <quantum optics> and the foundations of <quantum mechanics>.<Professional profile of Alain Aspect (academie-sciences.fr)>[Biographie, first two paragraphs.]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Alain%20Aspect%20%2826341660894%29%20%28cropped%29.jpg?width=250]
{title=Portrait of <Alain Aspect>}
{description=École polytechnique Université Paris-Saclay; Adem, existing portrait crop. https://creativecommons.org/licenses/by-sa/2.0/[CC BY-SA 2.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Alain_Aspect_(26341660894)_(cropped).jpg}
{width=250}
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