NDLI: Biphoton generation in quadratic waveguide arrays: A classical optical simulation

Content Provider	PubMed Central
Author	Gräfe, M. Solntsev, A. S. Keil, R. Sukhorukov, A. A. Heinrich, M. Tünnermann, A. Nolte, S. Szameit, A. Kivshar, Yu S.
Copyright Year	2012
Abstract	Quantum entanglement became essential in understanding the non-locality of quantum mechanics. In optics, this non-locality can be demonstrated on impressively large length scales, as photons travel with the speed of light and interact only weakly with their environment. Spontaneous parametric down-conversion (SPDC) in nonlinear crystals provides an efficient source for entangled photon pairs, so-called biphotons. However, SPDC can also be implemented in nonlinear arrays of evanescently coupled waveguides which allows the generation and the investigation of correlated quantum walks of such biphotons in an integrated device. Here, we analytically and experimentally demonstrate that the biphoton degrees of freedom are entailed in an additional dimension, therefore the SPDC and the subsequent quantum random walk in one-dimensional arrays can be simulated through classical optical beam propagation in a two-dimensional photonic lattice. Thereby, the output intensity images directly represent the biphoton correlations and exhibit a clear violation of a Bell-like inequality.
Related Links	http://dx.doi.org/10.1038/srep00562
Starting Page	562
File Format	PDF
ISSN	20452322
e-ISSN	20452322
Journal	Scientific Reports
Volume Number	2
Language	English
Publisher	Nature Publishing Group
Publisher Date	2012-08-01
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Science and technology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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