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    This study demonstrates a novel electro-optic polarization converter for quantum photonics operating at cryogenic temperatures. The device, built on lithium niobate waveguides, successfully converts light polarization at 0.8 K, enabling integrated cryogenic photonic systems.

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    Area of Science:

    • Quantum Photonics
    • Cryogenic Engineering
    • Materials Science

    Background:

    • Quantum photonic technologies often necessitate cryogenic operating conditions.
    • Active photonic components like switches and modulators must be compatible with low temperatures.
    • Integrating active components with cryogenic systems presents a significant engineering challenge.

    Purpose of the Study:

    • To demonstrate an electro-optic polarization converter suitable for cryogenic environments.
    • To enable active control of light polarization in quantum photonics at low temperatures.
    • To develop a compatible platform for integrated cryogenic photonic devices.

    Main Methods:

    • Fabrication of titanium in-diffused lithium niobate waveguides.
    • Characterization of polarization conversion efficiency at 1550 nm wavelength.
    • Operation and testing of the device at cryogenic temperatures (0.8 K).

    Main Results:

    • Achieved fiber-to-fiber transmission greater than 43% at 0.8 K.
    • Demonstrated a modulation depth of 23.6±3.3 dB.
    • Obtained a conversion voltage-length product of 28.8 V cm.

    Conclusions:

    • The developed electro-optic polarization converter is compatible with cryogenic conditions.
    • This technology facilitates the integration of active photonic components into cryogenic systems.
    • Enables advancements in quantum photonics requiring low-temperature operation.