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Using spontaneous parametric down conversion and a 50:50 beam splitter, wegenerate coaxial polarization-entangled photon pairs, of which the two photonsare far separated from each other. The photons are then sent one by one throughone port of a modified Mach-Zehnder interferometer. We observe interferencefringes with a periodicity half of the single-photon wavelength, independent ofthe distance between the photons. This feature can find applications inquantum-enhanced measurement.

Interference of overlap-free entangled photons with a Mach-Zehnder-like interferometer