Liang Han, Mingtao Cao, Ruifeng Liu, Hao Liu, Wenge Guo, Dong Wei, Shaoyan Gao, Pei Zhang, Hong Gao
We propose a scheme to distinguish the orbital angular momentum state of the Laguerre-Gaussian (LG) beam based on the electromagnetically induced transparency modulated by a microwave field in atomic ensembles. We show that the transverse phase variation of a probe beam with the LG mode can be mapped into the spatial intensity distribution due to the change of atomic coherence caused by the microwave. The proposal may provide a useful tool for studying higher-dimensional quantum information based on atomic ensembles.
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http://arxiv.org/abs/1207.2299
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