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Waveguide-coupled photonic crystal cavity for quantum dot spin readout.

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    We developed a novel photonic crystal cavity that efficiently couples light into two separate waveguides. This breakthrough enables potential applications in quantum dot spin readout and ultra-fast optical switching.

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    Area of Science:

    • Photonics
    • Optical Cavities
    • Quantum Information Science

    Background:

    • Photonic crystal cavities offer unique light-matter interaction properties.
    • Efficiently coupling cavity modes to external waveguides is crucial for device applications.
    • H1 cavities are known for their high quality factors and potential for mode control.

    Purpose of the Study:

    • To design and demonstrate a waveguide-coupled photonic crystal H1 cavity.
    • To achieve efficient and spatially separated coupling of orthogonal dipole modes.
    • To explore potential applications in quantum information processing and optical switching.

    Main Methods:

    • Fabrication of a photonic crystal H1 cavity structure.
    • Integration of two spatially separated photonic crystal waveguides.
    • Precise adjustment of waveguide position and orientation for optimized coupling.
    • Experimental verification of coupling efficiency and device behavior.

    Main Results:

    • Demonstrated efficient coupling of orthogonal dipole modes to separate waveguides.
    • Achieved coupled Q-factors up to 1600.
    • Obtained contrast ratios up to 10.
    • Verified device performance for cavity mode splitting both larger and smaller than the cavity linewidth.

    Conclusions:

    • The developed waveguide-coupled H1 cavity structure enables controlled light coupling.
    • This design shows promise for spin state readout of quantum dots.
    • The device may function as an ultra-fast optical switch at the single-photon level.