title: Quantum information transfer from spin to orbital angular momentum of photons.
abstract: The optical "spin-orbit" coupling occurring in a suitably patterned nonuniform birefringent plate known as a "q plate" allows entangling the polarization of a single photon with its orbital angular momentum (OAM). This process, in turn, can be exploited for building a bidirectional "spin-OAM interface," capable of transposing the quantum information from the spin to the OAM degree of freedom of photons and vice versa. Here, we experimentally demonstrate this process by single-photon quantum tomographic analysis. Moreover, we show that two-photon quantum correlations such as those resulting from coalescence interference can be successfully transferred into the OAM degree of freedom.
authors: Dipartimento di Fisica dell'Università La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma 00185, Italy.
authors: Eleonora
authors: E
authors: Nagali
authors: Fabio
authors: F
authors: Sciarrino
authors: Francesco
authors: F
authors: De Martini
authors: Lorenzo
authors: L
authors: Marrucci
authors: Bruno
authors: B
authors: Piccirillo
authors: Ebrahim
authors: E
authors: Karimi
authors: Enrico
authors: E
authors: Santamato