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From the following article:

Entanglement of the orbital angular momentum states of photons

Alois Mair, Alipasha Vaziri, Gregor Weihs and Anton Zeilinger

Nature 412, 313-316(19 July 2001)

doi:10.1038/35085529

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 1

The wave front (top) and the intensity pattern (bottom) of the simplest Laguerre–gaussian (LGlp) or 'doughnut' mode.

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Figure 2

Experimental set-up for single-photon mode detection.

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Figure 3

Conservation of orbital angular momentum.

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Figure 4

Experimental evidence (left; right, simulation) of entanglement of photon states with phase singularities.

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