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Published on: November 12, 2013
Generation of light carrying orbital angular momentum via induced coherence grating in cold atoms
1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil.
Abstract:
We report on the generation of light carrying orbital angular momentum through Bragg diffraction into an electromagnetically induced coherence grating in a degenerate two-level system of cold cesium atoms. The induced Zeeman coherence grating is shown to contain the spatial phase structure of the incident beams. The exchange of phase information between a light beam with orbital angular momentum and a long-lived atomic coherence opens up the way to process quantum information encoded in a multidimensional state space.
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