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The orbital angular momentum of photons, being defined in an infinitelydimensional discrete Hilbert space, offers a promising resource forhigh-dimensional quantum information protocols in quantum optics. The biggestobstacle to its wider use is presently represented by the limited set of toolsavailable for its control and manipulation. Here, we introduce and testexperimentally a series of simple optical schemes for the coherent transfer ofquantum information from the polarization to the orbital angular momentum ofsingle photons and vice versa. All our schemes exploit a newly developedoptical device, the so-called "q-plate", which enables the manipulation of thephoton orbital angular momentum driven by the polarization degree of freedom.By stacking several q-plates in a suitable sequence, one can also access tohigher-order angular momentum subspaces. In particular, we demonstrate thecontrol of the orbital angular momentum $m$ degree of freedom within thesubspaces of $|m|=2 \hbar$ and $|m|=4\hbar$ per photon. Our experiments provethat these schemes are reliable, efficient and have a high fidelity.

Polarization control of single photon quantum orbital angular momentum states