# Pure helicity vortex and spin-state-dependent quantum coherence in twisted light

@inproceedings{Yang2021PureHV, title={Pure helicity vortex and spin-state-dependent quantum coherence in twisted light}, author={Li-Ping Yang and Dazhi Xu}, year={2021} }

The topological charge of a photonic vortex is the essential quantity in singular optics and the critical parameter to characterize the vorticity of twisted light. However, the definition of the photonic topological charge remains elusive. Here, we put forth a theoretical formalism to provide a comprehensive treatment of photonic vortices. We introduce quantum operators for the photon current density and helicity current density based on the continuity equations from the paraxial Helmholtz…

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