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    We developed a new method to generate high-dimensional entangled states for quantum communication. This approach significantly increases the generation rate and improves the fidelity of entangled photons, overcoming previous limitations.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Technologies
    • Photonics

    Background:

    • High-dimensional entangled states are crucial for efficient long-range quantum communications.
    • Orbital Angular Momentum (OAM) enhances quantum communication bandwidth.
    • Current methods for generating high-dimensional entanglement, like concentration, suffer from low brightness and scalability issues.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel method for generating high-dimensional entangled qutrits.
    • To overcome the brightness limitations of existing entanglement generation techniques.
    • To enhance the efficiency and fidelity of quantum communication protocols.

    Main Methods:

    • Generating entangled qutrits in the OAM space by loading pump light with OAM.
    • Experimental validation of the proposed method.
    • Characterization of photon pair generation rate, noise resilience, and state fidelity.

    Main Results:

    • Achieved a significant 5.5-fold increase in the photon pair generation rate compared to the concentration method.
    • Demonstrated improved resistance to background noise.
    • Increased the fidelity of the reconstructed density matrix from 57.8% to 70%.

    Conclusions:

    • The proposed method offers a significant advantage for high-dimensional entanglement generation.
    • This advancement is critical for developing more robust and efficient quantum communication systems.
    • The improved generation rate and fidelity pave the way for practical quantum repeaters and networks.