Phys. Rev. Lett. 67, 318–321 (1991)Induced coherence and indistinguishability in optical interferenceReceived 18 March 1991; published in the issue dated 15 July 1991 Second-order interference is observed in the superposition of signal photons from two coherently pumped parametric down-converters, when the paths of the idler photons are aligned. The interference exhibits certain nonclassical features; it disappears when the idlers are misaligned or separated by a beam stop. The interpretation of this effect is discussed in terms of the intrinsic indistinguishability of the photon paths. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.318
DOI:
10.1103/PhysRevLett.67.318
PACS:
42.50.Dv, 42.50.Wm
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