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    Area of Science:

    • Quantum optics
    • Atomic spectroscopy

    Background:

    • Spectroscopic measurements demand high sensitivity.
    • Two-photon Raman transitions offer a pathway for enhanced spectroscopy.
    • Quantum phenomena like squeezed states can potentially improve measurement precision.

    Purpose of the Study:

    • To investigate the use of two-mode intensity squeezed twin beams for enhanced spectroscopic measurements.
    • To demonstrate quantum-enhanced measurements of rubidium (Rb) vapor's hyperfine structure.
    • To reduce the operational requirements for spectroscopic experiments.

    Main Methods:

    • Generation of two-mode intensity squeezed twin beams in Rb vapor.
    • Utilizing these beams to drive two-photon Raman transitions.
    • Recording spectroscopic data of the Rb 5D3/2 hyperfine structure.

    Main Results:

    • Achieved quantum-enhanced measurements of the Rb 5D3/2 hyperfine structure.
    • Demonstrated reduced requirements for Raman pump laser power.
    • Showcased reduced Rb vapor number density needs for sensitive measurements.

    Conclusions:

    • Two-mode intensity squeezed twin beams are effective for quantum-enhanced spectroscopy.
    • This approach significantly lowers the necessary laser power and vapor density.
    • The findings pave the way for more accessible and sensitive spectroscopic techniques.