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    Researchers achieved 10.1-dB squeezed light using a broadband periodically poled lithium niobate (PPLN) waveguide optical parametric amplifier (OPA). This advancement in squeezed light generation is crucial for developing fault-tolerant quantum computation.

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    Area of Science:

    • Quantum Optics
    • Nonlinear Optics
    • Materials Science

    Background:

    • Squeezed light generation is essential for quantum information processing.
    • Previous work demonstrated 8.3-dB squeezing using a PPLN waveguide OPA.
    • Reducing phase fluctuations and optical losses are key challenges.

    Purpose of the Study:

    • To improve squeezed light generation beyond 10 dB.
    • To develop a novel phase detection technique for squeezed light.
    • To advance the realization of fault-tolerant quantum computation.

    Main Methods:

    • Utilized a broadband periodically poled lithium niobate (PPLN) waveguide optical parametric amplifier (OPA).
    • Implemented a new phase detection technique using a phase-detection OPA seeded by probe and pump light before the squeezer OPA.
    • Minimized phase fluctuations and optical losses in the measurement system.

    Main Results:

    • Achieved 10.1 ± 0.2-dB squeezed light.
    • Reduced phase fluctuation angle from 14 mrad to 9 mrad.
    • Decreased total optical loss from 12% to 8%.

    Conclusions:

    • The developed broadband waveguide OPA surpasses 10 dB squeezing.
    • The novel phase detection method effectively reduces noise without degrading squeezing.
    • This work represents a significant step towards fault-tolerant quantum computation.