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    Area of Science:

    • Quantum optics
    • Integrated photonics
    • Nonlinear optics

    Background:

    • Integrated nonlinear optical devices offer miniaturized platforms for quantum light generation.
    • Squeezed light is crucial for surpassing classical limits in precision measurements.

    Purpose of the Study:

    • To report a fully guided setup for single-mode squeezing on integrated periodically poled nonlinear resonators.
    • To demonstrate the application of fiber-coupled squeezed light in phase sensing.
    • To investigate the impact of photorefraction on resonator stability.

    Main Methods:

    • Utilized titanium-indiffused periodically poled nonlinear resonators for squeezed light generation.
    • Employed single-mode fibers for delivering laser beams and collecting squeezed light.
    • Implemented a fiber-based phase sensing experiment to evaluate the generated squeezed light.

    Main Results:

    • Achieved up to -3.17(9) dB of useful squeezing available in single-mode fibers.
    • Demonstrated a quantum enhancement in the signal-to-noise ratio of 0.35 dB in fiber-based phase sensing.
    • Identified photorefraction as a source of system instabilities at high optical powers.

    Conclusions:

    • The developed fiber-coupled device enables practical applications of squeezed light in sensing.
    • Integrated squeezed light sources show promise for enhanced precision measurements.
    • Understanding and mitigating photorefraction is essential for stable operation of integrated nonlinear resonators.