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    We introduce a new quantum frequency conversion method using third-order sum/difference frequency generation (TSFG/TDFG) in silicon nitride microring resonators. This technique efficiently bridges visible and telecom frequencies for quantum networks, minimizing pump-induced noise.

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    Area of Science:

    • Quantum optics
    • Quantum information science
    • Integrated photonics

    Background:

    • Quantum frequency conversion (QFC) is crucial for connecting quantum memories in fiber-based quantum networks.
    • Existing QFC methods (e.g., SFG, DFG, FWM-BS) often suffer from broadband noise from pump lasers.
    • Bridging the visible and telecom spectral bands is essential for quantum network integration.

    Purpose of the Study:

    • To propose and investigate third-order sum/difference frequency generation (TSFG/TDFG) as a novel QFC interface.
    • To address the challenge of broadband noise in current QFC techniques.
    • To demonstrate efficient QFC across large spectral gaps using microresonators.

    Main Methods:

    • Utilizing waveguide-coupled silicon nitride microring resonators for TSFG/TDFG.
    • Designing microring resonators for efficient frequency conversion between 606 nm (visible) and 1550 nm (telecom).
    • Simulating device dispersion and coupling parameters to estimate conversion efficiency.

    Main Results:

    • TSFG/TDFG effectively mediates frequency conversion by combining two long-wavelength pump photons.
    • Efficient QFC (greater than 80%) is predicted between 606 nm and 1550 nm using a 1990 nm pump.
    • High efficiency is achievable at a low pump power of 50 mW.

    Conclusions:

    • Microresonator-based TSFG/TDFG offers a promising solution for compact and scalable QFC.
    • This approach significantly reduces pump-induced noise compared to conventional methods.
    • The proposed TSFG/TDFG interface is suitable for low-power, efficient quantum frequency conversion across large spectral gaps.