Role of pump coherence in two-photon interferometry

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https://journals.aps.org/pra/abstract/10.1103/PhysRevA.83.033812

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https://doi.org/10.1103/PhysRevA.83.033812
 http://hdl.handle.net/11603/19327

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2011-03-10

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journal articles
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J. Liang, S. M. Hendrickson, and T. B. Pittman, Role of pump coherence in two-photon interferometry, Phys. Rev. A 83, 033812 (2011), DOI:https://doi.org/10.1103/PhysRevA.83.033812

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©2011 American Physical Society

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Abstract

We use a parametric down-conversion source pumped by a short-coherence-length continuous-wave (CW) diode laser to perform two-photon interferometry in an intermediate regime between the more familiar Franson-type experiments with a long-coherence-length pump laser, and the short pulsed pump “time-bin” experiments pioneered by Gisin’s group. The use of a time-bin-like Mach-Zehnder interferometer in the CW pumping beam induces coherence between certain two-photon amplitudes, while the CW nature of the experiment prevents the elimination of remaining incoherent ones. The experimental results highlight the role of pump coherence in two-photon interferometry.