Roey Pomerantz, Yaakov Shaked, Avi Peer
We demonstrate a simple two-photon, nonclassical interference between the generation amplitudes of ultra-broadband entangled photon pairs (bi-photons) in two different nonlinear media, allowing measurement of the bi-photons spectral phase. In an analogy to a Mach-Zehnder interferometer, the nonlinear media act as beam splitters that couple between the pump beam and the bi-photons. The nonclassical nature of the interference is demonstrated by observing the dependence of the interference contrast on internal loss, analogous to an attempt to obtain 'which-path' information.
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http://arxiv.org/abs/1209.4194
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