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    We developed a new method for testing individual coupled-mode integrated beam splitters (IBS) within photonic integrated circuits (PICs). This technique enables accurate component-wise testing, crucial for advancing quantum information processing (QIP) technologies.

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    Area of Science:

    • Photonics
    • Quantum Information Processing
    • Optical Engineering

    Background:

    • Photonic integrated circuits (PICs) are essential for quantum information processing (QIP).
    • Coupled-mode integrated beam splitters (IBS) are key components in PICs.
    • Accurate testing of individual IBSs is crucial for scaling up PIC development for QIP.

    Purpose of the Study:

    • To demonstrate a method for component-wise testing of coupled-mode IBSs.
    • To overcome limitations on component location and PIC architectures in IBS testing.
    • To enable direct and accurate assessment of individual IBS performance within complex PICs.

    Main Methods:

    • Utilizing a custom-built multifunctional adaptive optical microscope for IBS imaging.
    • Employing numerical modeling to calculate the beam-splitting ratio of individual IBSs.
    • Implementing a solution for testing IBSs irrespective of their position or the PIC's architecture.

    Main Results:

    • Successful demonstration of a component-wise testing solution for coupled-mode IBSs.
    • Achieved accurate assessment of IBS beam-splitting ratios.
    • The method is versatile and applicable to various PIC architectures and component locations.

    Conclusions:

    • The developed method provides a flexible and accurate approach for testing individual IBSs in PICs.
    • This capability is vital for the advancement and scalability of PICs for QIP.
    • The technique facilitates improved design and validation of photonic devices for quantum technologies.