Identifying the orbital angular momentum of light based on atomic ensembles
Liang Han, Mingtao Cao, Ruifeng Liu, Hao Liu, Wenge Guo, Dong Wei,, Shaoyan Gao, Pei Zhang, and Hong Gao
TL;DR
This paper presents a method to identify the orbital angular momentum of Laguerre-Gaussian beams using atomic ensembles modulated by microwave fields, enabling advanced quantum information processing.
Contribution
It introduces a novel scheme that maps the phase variation of LG beams into spatial intensity patterns via atomic coherence control.
Findings
The scheme effectively distinguishes LG modes based on their phase structure.
Microwave modulation enhances the detection sensitivity of orbital angular momentum.
Potential applications in high-dimensional quantum information processing.
Abstract
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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