Alain Aspect and his colleagues switched how they measured pairs of photons while the light was still in flight. Their experiment sharpened an existing test of quantum entanglement.
Institut d’Optique Graduate School / CNRS
Professor, Augustin Fresnel Chair; emeritus CNRS research director
Why included? 4 sources
In 1972, Stuart Freedman and John Clauser measured correlations between pairs of photons that violated a Bell inequality. Their measurement settings stayed fixed during each run. A decade later, Aspect, Jean Dalibard and Gérard Roger switched the settings while the photons were travelling. The correlations still exceeded the bound predicted by local hidden-variable models under the assumptions of the test. Later experiments by Aspect’s team used individual photons to study interference and ultracold atoms to see how disorder can stop matter waves from spreading.
Documented work base: France
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