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

Poulios, Konstantinos; Keil, Robert; Fry, Daniel; D. A. Meinecke, Jasmin; C. F. Matthews, Jonathan; Politi, Alberto; Lobino, Mirko; Gr�fe, Markus; Heinrich, Matthias; Nolte, Stefan; Szameit, Alexander; L. O'Brien, Jeremy

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.

Citation

Poulios, K., Keil, R., Fry, D., D. A. Meinecke, J., C. F. Matthews, J., Politi, A., Lobino, M., Gräfe, M., Heinrich, M., Nolte, S., Szameit, A., & L. O'Brien, J. (2014). Quantum Walks of Correlated Photon Pairs in Two-Dimensional Waveguide Arrays. Physical Review Letters, 112(14), Article 143604. https://doi.org/10.1103/PhysRevLett.112.143604

• Journal Article Type: Article
• Publication Date: Apr 11, 2014
• Deposit Date: Sep 23, 2019
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 112
• Issue: 14
• Article Number: 143604
• DOI: https://doi.org/10.1103/PhysRevLett.112.143604
• Keywords: Quantum Physics
• Public URL: https://nottingham-repository.worktribe.com/output/2465709
• Publisher URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.143604