Abstract

Single photons emerging from Pancharatnam–Berry phase optical elements (q plates) exhibit entanglement in the degrees of freedom of spin and orbital angular momentum. We put forward an experimental scheme for probing the spin–orbit correlations of single photons. It is found that the Clauser–Horne–Shimony–Holt parameter S for the single-photon spin–orbit entangled state could be as high as $2\sqrt{2}$, evidently violating the Bell-like inequality and thus invalidating the noncontextual hidden variable theories.

© 2010 Optical Society of America

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