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Classical to quantum optical network link for orbital angular momentum-carrying light.

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    We demonstrate a novel optical network link using orbital angular momentum (OAM) conservation. This breakthrough enables tunable quantum entanglement for advanced optical communication networks.

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    Area of Science:

    • Quantum Optics
    • Nonlinear Optics
    • Optical Communications

    Background:

    • Orbital Angular Momentum (OAM) is a key property of light with applications in optical communications.
    • Nonlinear optical processes offer pathways to generate and manipulate quantum states of light.

    Purpose of the Study:

    • To establish a classical-to-quantum optical network link utilizing OAM conservation.
    • To demonstrate the generation of OAM-entangled photon pairs and control their correlations.

    Main Methods:

    • Sum frequency generation (SFG) to up-convert classical OAM beams.
    • Spontaneous parametric down-conversion (SPDC) to generate entangled photon pairs.
    • Utilizing OAM conservation in nonlinear interactions.

    Main Results:

    • Successfully created a classical-to-quantum optical network link in OAM degrees of freedom.
    • Generated non-degenerate OAM entangled photon pairs at 795 nm and 1550 nm.
    • Demonstrated tunable OAM correlations in the quantum channel by manipulating the classical OAM input.

    Conclusions:

    • The developed method provides a flexible platform for generating OAM-entangled states.
    • This work paves the way for advanced quantum communication protocols leveraging OAM.
    • Verified high-level OAM entanglements in two-dimensional subspaces.