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. 2009 May 11;17(10):8287-93.
doi: 10.1364/oe.17.008287.

Violation of a Bell Inequality in Two-Dimensional Orbital Angular Momentum State-Spaces

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Violation of a Bell Inequality in Two-Dimensional Orbital Angular Momentum State-Spaces

J Leach et al. Opt Express. .
Free article

Abstract

We observe entanglement between photons in controlled super-position states of orbital angular momentum (OAM). By drawing a direct analogy between OAM and polarization states of light, we demonstrate the entangled nature of high order OAM states generated by spontaneous downconversion through violation of a suitable Clauser Horne Shimony Holt (CHSH)-Bell inequality. We demonstrate this violation in a number of two-dimensional subspaces of the higher dimensional OAM Hilbert space.

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