Spin-orbit hybrid entanglement of photons and quantum contextuality

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

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Spin-orbit hybrid entanglement of photons and quantum contextuality

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arxiv 1103.3962 v1 pith:VEETMI2H submitted 2011-03-21 quant-ph physics.optics

Ebrahim Karimi , Jonathan Leach , Sergei Slussarenko , Bruno Piccirillo , Lorenzo Marrucci , Lixiang Chen , Weilong She , Sonja Franke-Arnold

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Miles J. Padgett Enrico Santamato

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classification quant-phphysics.optics

keywords entanglementphotonhybridpairsquantumorbitalphotonsreported

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abstract

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 non-local, 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.

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