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

Abstract

We demonstrate quantum walks of correlated photons in a 2D network of directly laser written waveguides coupled in a 'swiss cross' arrangement. The correlated detection events show high-visibility quantum interference and unique composite behaviour: 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 non-classical behaviour in a non-planar structure.

Journal Article Type Article
Publication Date Apr 11, 2014
Journal Physical Review Letters
Print ISSN 0031-9007
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 112
Issue 14
Article Number 143604
APA6 Citation Poulios, K., Keil, R., Fry, D., D. A. Meinecke, J., C. F. Matthews, J., Politi, A., …L. O'Brien, J. (2014). Quantum Walks of Correlated Photon Pairs in Two-Dimensional Waveguide Arrays. Physical Review Letters, 112(14), https://doi.org/10.1103/PhysRevLett.112.143604
DOI https://doi.org/10.1103/PhysRevLett.112.143604
Keywords Quantum Physics
Publisher URL https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.143604

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