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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Optical engineering

    Background:

    • Quantum networks require precise control over optical pulses.
    • Simultaneous frequency conversion and spectral compression are vital for manipulating quantum states.
    • Existing methods face challenges with efficiency and stability.

    Purpose of the Study:

    • To propose a slow-light scheme for simultaneous frequency conversion and spectral compression of weak optical pulses.
    • To enable the manipulation of optical pulses in any quantum state, including single-photon states.
    • To enhance the feasibility of quantum network construction.

    Main Methods:

    • Theoretical modeling of a slow-light waveguide.
    • Utilizing sum-frequency generation (SFG) for pulse conversion.
    • Analyzing suppression of spatial-temporal oscillations via delayed SFG field.

    Main Results:

    • A 3-ps signal pulse can be converted to the ns regime with a spectral compression factor of ~1000.
    • Achieved intrinsic efficiency up to 83%.
    • Suppressed deleterious spatial-temporal oscillations, preventing back-conversion.

    Conclusions:

    • The proposed slow-light scheme offers efficient and stable spectral compression and frequency conversion.
    • The generated near-exponential rising pulse shape is suitable for temporal-mode matching into optical cavities.
    • This method advances the development of robust quantum networks.