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Active stabilization of a fiber-optic two-photon interferometer using continuous optical length control.

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    |July 14, 2016
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    Researchers developed a two-step method to stabilize optical fiber interferometers for quantum communication. This technique enabled stable two-photon quantum interference over 6 km, achieving high visibility crucial for quantum networks.

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    Area of Science:

    • Quantum communication
    • Quantum optics
    • Fiber optics

    Background:

    • Long-distance quantum communication relies on stable quantum interference of single photons.
    • Active stabilization of optical path lengths is essential for maintaining single-photon coherence.

    Purpose of the Study:

    • To present a two-step interferometer stabilization method for quantum communication.
    • To demonstrate two-photon quantum interference in a long-distance fiber-optic setup.

    Main Methods:

    • Implemented a two-step interferometer stabilization technique with continuous optical length control.
    • Utilized a 6-km-long fiber-optic Hong-Ou-Mandel interferometer.
    • Applied active control for measuring stable two-photon interference fringes by scanning optical path-length difference.

    Main Results:

    • Achieved highly stable two-photon interference fringes.
    • Obtained a two-photon interference visibility of approximately 90.7% with accidental subtraction.
    • Measured a visibility of 65.4% without accidental subtraction.

    Conclusions:

    • The developed two-step stabilization method is effective for long-distance quantum communication.
    • Stable two-photon interference is achievable in kilometer-scale fiber-optic systems.
    • The results pave the way for practical entanglement-based quantum communication networks.