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Integrated visible-light polarization rotators and splitters for atomic quantum systems.

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    We developed the first integrated polarization splitters and rotators for blue wavelengths, crucial for controlling trapped-ion quantum systems. These compact devices demonstrate high efficiency for strontium ion laser cooling applications.

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    Area of Science:

    • Integrated photonics
    • Quantum information science
    • Atomic physics

    Background:

    • Precise control of light polarization is essential for manipulating quantum states in trapped ions and neutral atoms.
    • Existing integrated photonic solutions often lack efficiency or are not optimized for specific wavelengths relevant to atomic transitions.

    Purpose of the Study:

    • To design and demonstrate the first integrated polarization splitters and rotators operating at blue wavelengths.
    • To develop compact and efficient photonic devices for the 422-nm laser-cooling transition of 88Sr+ ions.
    • To enable advanced integrated control for trapped-atom quantum technologies.

    Main Methods:

    • Design of compact polarization splitter and rotator devices using advanced simulation techniques.
    • Fabrication of these devices using a standard 200-mm wafer-scale semiconductor process.
    • Experimental characterization of device performance, including coupling efficiency and polarization conversion.

    Main Results:

    • A polarization splitter achieved 98.0% transverse-electric thru-port coupling and 77.6% transverse-magnetic tap-port coupling in a 16-µm device.
    • A polarization rotator demonstrated a 92.2% conversion efficiency in a 111-µm device.
    • Both devices were successfully fabricated and validated at a 422-nm wavelength.

    Conclusions:

    • This work presents the first integrated photonic devices for polarization control at blue wavelengths.
    • The developed devices offer high performance and compactness, suitable for 88Sr+ ion laser cooling.
    • These advancements are critical for building more sophisticated integrated control systems for trapped-atom quantum computing and simulation.