Single-Photon Spin-Orbit Entangled States in Optical Fibers

Abstract

According to the expressions of orbital angular momentum modes in optical fibers, we reveal the physical meanings of the corresponding angular and radial mode orders of the even and odd vector modes. Then we demonstrate that just like orbital angular momentum modes can be represented with linear combinations of even and odd vector modes in optical fibers, even and odd vector modes can in turn be represented with linear combinations of orbital angular momentum modes. The final results suggest that the even and odd vector modes in optical fibers can be considered as single-photon spin-orbit entangled states, indicating the possibility of using optical fiber structures to generate single-photon spin-orbit entangled states.