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Spin-orbit hybrid entanglement of photons and quantum contextuality

2010; American Physical Society; Volume: 82; Issue: 2 Linguagem: Inglês

10.1103/physreva.82.022115

1538-4446

Ebrahim Karimi, Jonathan Leach, Sergei Slussarenko, Bruno Piccirillo, Lorenzo Marrucci, Lixiang Chen, Weilong She, Sonja Franke‐Arnold, Miles J. Padgett, Enrico Santamato,

Orbital Angular Momentum in Optics

We demonstrate electromagnetic quantum states of single photons and of correlated photon pairs exhibiting ``hybrid'' entanglement between spin and orbital angular momentum. These states are obtained from entangled photon pairs emitted by spontaneous parametric down conversion by employing a $q$ plate for coupling the spin and orbital degrees of freedom of a photon. Entanglement and contextual quantum behavior (that is also nonlocal, in the case of photon pairs) is demonstrated by the reported violation of the Clauser-Horne-Shimony-Holt inequality. In addition, a classical analog of the hybrid spin-orbit photonic entanglement is reported and discussed.