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Atomic resonant single-mode squeezed light from four-wave mixing through feedforward.

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    Researchers generated single-mode squeezed light using quantum correlations from twin beams. This technique enhances quantum sensing by reducing noise in atomic sensors, achieving significant squeezing levels on and off atomic resonance.

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    Area of Science:

    • Quantum optics
    • Atomic physics
    • Quantum sensing

    Background:

    • Squeezed states of light are crucial for quantum-enhanced sensing.
    • Generating narrowband, single-mode squeezed light near atomic resonance is essential for atomic sensors.
    • Previously, bright two-mode squeezed states (twin beams) were generated using non-degenerate four-wave mixing in Rb85 vapor.

    Purpose of the Study:

    • To generate single-mode amplitude squeezed light by transferring quantum correlations from twin beams.
    • To achieve narrowband squeezed states of light tuned to atomic resonance for enhanced atomic sensing.

    Main Methods:

    • Utilized a feedforward technique to transfer amplitude quantum correlations.
    • Employed a non-degenerate four-wave-mixing process in a double-lambda configuration.
    • Tuned the generated light to the D1 line of Rubidium-87 (Rb87).

    Main Results:

    • Successfully generated single-mode amplitude squeezed light.
    • Achieved -2.9±0.1 dB squeezing off resonance.
    • Obtained -2.0±0.1 dB squeezing on resonance with the Rb87 D1 F=2 to F'=2 transition.

    Conclusions:

    • The feedforward technique effectively generates single-mode squeezed light.
    • The generated squeezed light is suitable for enhancing atomic-based sensors.
    • Demonstrated the potential for improved quantum sensing applications.