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    We demonstrate polarization-preserving quantum frequency conversion using continuous-wave stimulated Raman scattering in a hydrogen-filled fiber. This method offers a promising alternative to nonlinear crystals for quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Networking
    • Photonics

    Background:

    • Photons serve as flying qubits in large-area quantum networks and hybrid quantum architectures.
    • Quantum frequency conversion is crucial for interfacing quantum components operating at different wavelengths.
    • Current methods using nonlinear crystals face limitations in bandwidth, tunability, polarization, and background noise.

    Purpose of the Study:

    • To demonstrate a novel, polarization-preserving quantum frequency conversion technique.
    • To explore stimulated Raman scattering (SRS) in gases as an alternative to nonlinear crystals.
    • To enable seamless integration of quantum frequency conversion into existing optical fiber infrastructure.

    Main Methods:

    • Utilized stimulated Raman scattering (SRS) in a hydrogen-filled antiresonant hollow-core fiber.
    • Employed two coherent continuous-wave (CW) pump fields, differing from pulsed pump methods.
    • Characterized the frequency conversion process for polarization preservation.

    Main Results:

    • Successfully achieved polarization-preserving quantum frequency conversion.
    • Demonstrated the efficacy of SRS in a gas-filled hollow-core fiber for this application.
    • Showcased the potential of CW pump fields for stable and efficient conversion.

    Conclusions:

    • SRS in hydrogen-filled hollow-core fibers offers a robust and versatile platform for quantum frequency conversion.
    • This approach overcomes limitations of traditional nonlinear crystals.
    • The technique is well-suited for integration into fiber-based quantum networks and interfacing with single quantum emitters.