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Photorefractive effect in LiNbO3-based integrated-optical circuits for continuous variable experiments.

F Mondain, F Brunel, X Hua

    Optics Express
    |August 6, 2020
    PubMed
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    The photorefractive effect in lithium niobate integrated quantum photonic circuits can disrupt continuous variable on-chip experiments. Device heating may mitigate this issue, crucial for generating non-classical light.

    Area of Science:

    • Quantum optics and photonics
    • Materials science (Lithium Niobate)
    • Integrated photonics

    Background:

    • Lithium niobate (LiNbO3) integrated photonics are essential for quantum information processing.
    • Continuous variable (CV) quantum experiments require high-fidelity photonic circuits.
    • The photorefractive effect can degrade optical performance in LiNbO3 devices.

    Purpose of the Study:

    • To investigate the impact of the photorefractive effect on LiNbO3 integrated quantum photonic circuits for CV experiments.
    • To identify and characterize photorefractive-induced issues in key circuit components.
    • To evaluate device heating as a potential solution to mitigate photorefractivity.

    Main Methods:

    • Detailed characterization of circuit building blocks (cavities, directional couplers, nonlinear waveguides).

    Related Experiment Videos

  • Analysis of photorefractive effect induced by 775 nm light.
  • Assessment of non-classical light generation at 1550 nm telecom wavelength.
  • Experimental evaluation of device heating effects.

    • Main Results:

    • Photorefractivity can compromise CV quantum photonics experiments, even at low levels compared to spatial mode hopping.
    • Specific characterization methods were developed to identify photorefractive issues.
    • Device heating was explored as a method to counteract the photorefractive effect.

    Conclusions:

    • Photorefractive effects pose a significant challenge for reliable operation of LiNbO3 integrated quantum photonic circuits.
    • Understanding and mitigating photorefractivity is critical for advancing on-chip quantum technologies.
    • Device heating presents a promising strategy for managing photorefractive degradation in these systems.