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Two-mode squeezing over deployed fiber coexisting with conventional communications.

Joseph C Chapman, Alexander Miloshevsky, Hsuan-Hao Lu

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    Researchers demonstrate distributed two-mode squeezing of light, even with classical signals present. This breakthrough paves the way for advanced quantum networks and sensing applications without needing dedicated dark fiber.

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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Quantum Communication

    Background:

    • Squeezed light is essential for continuous-variable (CV) quantum information science.
    • Distributed multi-mode squeezing is key for CV quantum networks and distributed quantum sensing.
    • Previous multi-mode squeezing experiments were limited to dark fiber setups without classical signals.

    Purpose of the Study:

    • To demonstrate distributed two-mode squeezing of light that coexists with classical signals.
    • To show that squeezed light does not require dedicated dark fiber for distribution.
    • To enable future quantum networks and sensing applications requiring distributed multi-mode squeezing.

    Main Methods:

    • Frequency multiplexing of squeezed modes with classical signals (local oscillator, network signals).
    • Distribution of squeezed light through separate fiber spools (5 km) and deployed campus fibers (250 m, 1.2 km).
    • Measurement of joint two-mode squeezing using triggered homodyne detection in separate locations.

    Main Results:

    • Achieved -0.9 ± 0.1 dB coexistent two-mode squeezing after 5 km fiber distribution.
    • Measured -0.5 ± 0.1 dB coexistent two-mode squeezing after distribution through campus fibers.
    • Successfully demonstrated that squeezed modes can coexist with classical signals during distribution.

    Conclusions:

    • Distributed multi-mode squeezing is achievable alongside classical signals, eliminating the need for dark fiber.
    • This demonstration is a significant step towards practical implementation of quantum networks and distributed quantum sensing.
    • The ability to distribute squeezed light with classical signals opens new avenues for quantum technologies.