A double-slit experiment with entangled photons is theoretically analyzed. Itis shown that, under suitable conditions, two entangled photons of wavelength$\lambda$ can behave like a biphoton of wavelength $\lambda/2$. Theinterference of these biphotons, passing through a double-slit can be obtainedby detecting both photons of the pair at the same position. This is inagreement with the results of an earlier experiment. More interestingly, weshow that even if the two entangled photons are separated by a polarizing beamsplitter, they can still behave like a biphoton of wavelength $\lambda/2$. Inthis modified setup, the two separated photons passing through two differentdouble-slits, surprisingly show an interference corresponding to a wavelength$\lambda/2$, instead of $\lambda$ which is the wavelength of a each photon.Additionally, in this modified setup, if one moving detector counts photons incoincidence with the other fixed, the usual single-photon interference,corresponding to wavelength $\lambda$ is recovered.
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