Induced coherence and indistinguishability in optical interference

作者：X. Y. Zou, L. J. Wang, L. Mandeļ · 发表于：Physical Review Letters · 年份：1991 · DOI：10.1103/physrevlett.67.318 · 被引用次数：649 · 研究领域：Quantum Information and Cryptography、Quantum optics and atomic interactions、Laser-Matter Interactions and Applications

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.