Abstract
A two-photon correlation experiment that was proposed by Franson [ Phys. Rev. Lett. 62, 2205 ( 1989)] and was recently carried out is analyzed in terms of electromagnetic waves in order to see whether the observed fourth-order interference effects can be explained classically. The conclusion is that, although a classical field can give rise to such interference effects, no classical field can actually account for the observations reported.
© 1990 Optical Society of America
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