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Multimode single-pass spatio-temporal squeezing.

Luca La Volpe, Syamsundar De, Tiphaine Kouadou

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    We developed a new source of broadband multimode squeezed light using parametric down-conversion. This technology offers potential advancements for quantum information and quantum metrology applications.

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    Area of Science:

    • Quantum Optics
    • Quantum Information Science

    Background:

    • Squeezed light is crucial for quantum technologies.
    • Characterizing multimode squeezed states is challenging.

    Purpose of the Study:

    • To present a novel single-pass source of broadband multimode squeezed light.
    • To validate the spatio-temporal multimode nature of the generated light.

    Main Methods:

    • Utilized type I spontaneous parametric down-conversion (PDC) in a bulk nonlinear crystal.
    • Employed a non-collinear configuration for light generation.
    • Probed the squeezed light using homodyne detection with a shaped local oscillator.
    • Analyzed mode distribution using a covariance matrix approach.

    Main Results:

    • Successfully generated broadband squeezed light with multimode characteristics.
    • Demonstrated spatio-temporal multimode behavior of the squeezed light.
    • Unambiguously validated the multimode nature of the source through mode analysis.

    Conclusions:

    • The presented source is a valuable tool for quantum information and metrology.
    • The developed characterization method effectively reveals multimode properties.
    • This work advances the generation and understanding of complex quantum states.