Return to articleThe image of a double slit as experienced by one photon is imposed on the other photon that never goes through the slit. The entangled photon image obtained after coincidence gating shows a double-peak spacing of 1.89 millimeters. With a theoretical magnification of 2.5 times, the data predict that the real double slit has a spacing of 756 micrometers. The measured spacing of the real double slit is 750 plus or minus 25 micrometers, showing good agreement with theory. These data confirm that quantum entangled photons show a high level of momentum correlation. The single photon count was 3000 per second for the detector behind the double slit (a bucket detector) and about 300 per second for the (position-sensitive) scanning detector. The single photon counts remained relatively constant during the scan. Each point required 40 seconds to accumulate the coincidences shown.
Last updated: June 25, 2003
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