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Updated: Dec 21, 2025

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Gaussian spatial-polarization entanglement in a folded Mach-Zehnder interferometer.

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    Researchers studied spatial-polarization entanglement in light fields. Fringe movement during polarizer rotation reliably detects this entanglement, demonstrating tunable entanglement in an experiment.

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    Area of Science:

    • Quantum Optics
    • Quantum Information Science

    Background:

    • Coherent vectorial paraxial light fields exhibit complex spatial and polarization properties.
    • Entanglement, a key quantum phenomenon, is crucial for quantum information processing.

    Purpose of the Study:

    • To investigate Gaussian spatial-polarization entanglement in coherent vectorial paraxial light fields.
    • To establish a reliable method for detecting spatial-polarization entanglement.
    • To experimentally demonstrate tunable spatial-polarization entanglement.

    Main Methods:

    • Studying Gaussian light fields with controlled spatial overlap and orthogonal polarizations.
    • Utilizing fringe movement upon polarizer rotation as a detection signature.
    • Implementing a folded Mach-Zehnder interferometer for experimental demonstration.

    Main Results:

    • Fringe movement is identified as a sufficient condition for detecting spatial-polarization entanglement.
    • Two specific Gaussian light fields demonstrated nearly 1 ebit of spatial-polarization entanglement.
    • Tunable Gaussian spatial-polarization entanglement was successfully achieved experimentally.

    Conclusions:

    • The study provides a robust method for detecting spatial-polarization entanglement in paraxial vector light fields.
    • The experimental demonstration confirms the feasibility of generating and controlling spatial-polarization entanglement.
    • This work contributes to the understanding and application of quantum entanglement in optical systems.