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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Improved waveguide-based ultraviolet light generation and pulsed squeezing at 795 nm.

Aki Torii, Kosuke Shibata, Yujiro Eto

    Optics Express
    |October 14, 2022
    PubMed
    Summary

    Researchers generated pulsed squeezed light at 795 nm using periodically poled lithium niobate waveguides. This light is ideal for quantum-enhanced measurements with rubidium atoms, with potential for improvement by mitigating blue-light induced infrared absorption.

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    Area of Science:

    • Quantum Optics
    • Nonlinear Optics
    • Atomic Physics

    Background:

    • Quantum-enhanced measurements offer improved precision.
    • Rubidium atoms are crucial for atomic clocks and quantum sensing.
    • Waveguide-based squeezed light generation is key for practical quantum technologies.

    Purpose of the Study:

    • To generate pulsed squeezed light at 795 nm using periodically poled lithium niobate (PPLN) waveguides.
    • To investigate the suitability of this squeezed light for quantum-enhanced measurements with rubidium atoms.
    • To identify and address limitations in the squeezed light generation process.

    Main Methods:

    • Generation of pulsed ultraviolet second harmonic light (>400 mW) using a PPLN waveguide.
    • Injection of second harmonic light into another PPLN waveguide to achieve quadrature squeezing.

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  • Homodyne detection to measure squeezing levels.
  • Numerical simulation to understand pulse phase shifts.

    • Main Results:

    • Achieved quadrature squeezing with a level of -1.5(1) dB.
    • Observed intra-pulse phase shifts in the second harmonic pulse.
    • Attributed phase shifts to blue-light induced infrared absorption (BLIIRA) via experimental and simulation comparison.
    • Identified BLIIRA as a limiting factor for squeezing.

    Conclusions:

    • Successfully generated pulsed squeezed light at 795 nm suitable for rubidium atom applications.
    • Demonstrated the detrimental effect of BLIIRA on squeezed light generation.
    • Indicated that reducing BLIIRA can further enhance squeezing levels for improved quantum measurements.