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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Condensed Matter Physics

    Background:

    • Particle identity and entanglement are key quantum resources.
    • Understanding their correlation in identical particles is challenging.
    • Previous work suggested spatial overlap is needed for entanglement.

    Purpose of the Study:

    • To quantitatively analyze the role of particle indistinguishability in entanglement.
    • To investigate how entanglement behaves as spatial overlap and indistinguishability vary simultaneously.
    • To provide insights into entanglement in quantum networks of identical particles.

    Main Methods:

    • Theoretical investigation of entanglement for generic two-boson systems.
    • Experimental verification using a photonic system.
    • Simultaneous variation of spatial overlap and indistinguishability.

    Main Results:

    • Entanglement is a monotonically increasing function of both spatial overlap and indistinguishability.
    • Theoretical predictions for two-boson entanglement were experimentally confirmed.
    • Demonstrated a quantitative relationship between particle properties and entanglement.

    Conclusions:

    • The amount of entanglement in identical particles directly correlates with their indistinguishability and spatial overlap.
    • This work clarifies the interplay between particle identity and entanglement.
    • Findings are significant for developing quantum networks utilizing identical particles.