Violation of a Bell inequality in two-dimensional orbital angular momentum state-spaces
- Leach, J.
- Jack, B.
- Romero, J.
- Ritsch-Marte, M.
- Boyd, R.W.
- Jha, A.K.
- Barnett, S.M.
- Franke-Arnold, S.
- Padgett, M.J.
DOIAbstract
We observe entanglement between photons in controlled superposition 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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