Chad Orzel, an experimental physicist, has a pretty good explanation of this experiment (including the paper figures!) up on his blog: http://scienceblogs.com/

Chad Orzel, an experimental physicist, has a pretty good explanation of this experiment (including the paper figures!) up on his blog: http://scienceblogs.com/principles/2011/06/watching_photons_interfere_obs.php http://scienceblogs.com/principles/2011/06/watching_photons_...