Quantum Walks of Correlated Photon Pairs in Two-Dimensional Waveguide Arrays

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Author(s)
Poulios, Konstantinos
Keil, Robert
Fry, Daniel
Meinecke, Jasmin D. A.
Matthews, Jonathan C. F.
Politi, Alberto
Lobino, Mirko
Gräfe, Markus
Heinrich, Matthias
Nolte, Stefan
Szameit, Alexander
O’Brien, Jeremy L.
Griffith University Author(s)
Year published
2014
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Abstract
We demonstrate quantum walks of correlated photons in a two-dimensional network of directly laser written waveguides coupled in a "swiss cross" arrangement. The correlated detection events show high-visibility quantum interference and unique composite behavior: strong correlation and independence of the quantum walkers, between and within the planes of the cross. Violations of a classically defined inequality, for photons injected in the same plane and in orthogonal planes, reveal nonclassical behavior in a nonplanar structure.
Journal Title
Physical Review Letters
Volume
112
DOI
Copyright Statement
© 2014 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Quantum Information, Computation and Communication
Quantum Optics
Mathematical Sciences
Physical Sciences
Engineering
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