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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Continuously active interferometer stabilization and control for time-bin entanglement distribution.

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    We developed a new method for stabilizing quantum entanglement interferometers, enabling robust transmission of entangled photons over 50 km of fiber. This technique minimizes noise by reusing the pump laser, crucial for quantum communication advancements.

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    Area of Science:

    • Quantum optics
    • Quantum communication
    • Photonics

    Background:

    • Time-bin entanglement interferometers are key for quantum communication.
    • Maintaining phase stability and controlling interference are critical challenges.
    • Existing methods often struggle with long-distance fiber transmission.

    Purpose of the Study:

    • To present a novel method for continuous stabilization and phase control of entanglement interferometers.
    • To demonstrate the feasibility of transmitting entangled photons over significant fiber distances.
    • To address noise limitations in quantum signal transmission.

    Main Methods:

    • Developed a technique for continuous stabilization and fine-level phase control.
    • Reused the entangled-pair generation pump, co-propagating it with transmitted photons.
    • Characterized entangled photons by measuring two-photon interference fringes.

    Main Results:

    • Successfully demonstrated entangled photon transmission through 50 km of standard single-mode fiber.
    • The co-propagating pump introduced minimal noise to the entangled photons.
    • Achieved stable interference fringes, confirming entanglement preservation.

    Conclusions:

    • The new method enables robust, long-distance quantum entanglement distribution.
    • Co-propagating the pump is an effective strategy for noise reduction.
    • This technique advances the practical implementation of fiber-based quantum networks.