February 22, 2014

Using distant quasars to test Bell's theorem

The idea of the proposed experiment involving a pair of entangled particles (David Kaiser, MIT): "A split second after the particles are generated, but just before the detectors are set, scientists would use telescopic observations of distant quasars to determine which properties each detector will measure of a respective particle. In other words, quasar A determines the settings to detect particle A, and quasar B sets the detector for particle B. The researchers reason that since each detector's setting is determined by sources that have had no communication or shared history since the beginning of the universe, it would be virtually impossible for these detectors to "conspire" with anything in their shared past to give a biased measurement; the experimental setup could therefore close the "free will" loophole." Read the full article here (Closing the 'free will' loophole: Using distant quasars to test Bell's theorem - sciencedaily.com). Image source: Wikipedia.