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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Optical spin-orbit coupling is a key phenomenon with diverse applications.
    • Entanglement is crucial for quantum technologies.

    Purpose of the Study:

    • To investigate spin-orbit total angular momentum entanglement in optical parametric downconversion.
    • To demonstrate the generation and characterization of entangled vector vortex modes.

    Main Methods:

    • Experimentally generated four pairs of entangled vector vortex modes.
    • Utilized a dispersion- and astigmatism-compensated single optical parametric oscillator.
    • Characterized spin-orbit quantum states on the quantum higher-order Poincaré sphere.

    Main Results:

    • Successfully generated entangled vector vortex modes.
    • Demonstrated the relationship of spin-orbit total angular momentum Stokes entanglement.
    • Characterized quantum states on the quantum higher-order Poincaré sphere for the first time.

    Conclusions:

    • The study demonstrates a novel method for generating and characterizing spin-orbit entangled states.
    • These entangled states hold significant potential for advancing high-dimensional quantum communication.
    • The findings also suggest applications in advanced multiparameter measurement techniques.