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Nature 429, 139-141 (13 May 2004) | doi:10.1038/429139a
Quantum physics: High NOON for photons
Dirk Bouwmeester1
Abstract
Entangled photons conspire to create interference patterns that would normally be associated with a wavelength much smaller than that of the individual photons — beating the diffraction limit.
If a double slit is illuminated with a laser beam of wavelength 
, the familiar rippling pattern of interference fringes arises, even if the attenuation of the laser is so strong that only single photons pass through the double slit at any given instant. To emphasize this quantum feature, Paul Dirac wrote1 that "Each photon interferes only with itself.
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