Quantum information transfer from spin to orbital angular momentum of photons
MARRUCCI, LORENZO and PICCIRILLO, BRUNO and KARIMI, EBRAHIM and SANTAMATO, ENRICO (2009) Quantum information transfer from spin to orbital angular momentum of photons. [Pubblicazione su rivista scientifica]
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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.
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