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Counter-diabatic driving in a bent mode-evolution coupler.

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    We demonstrate a new method for creating compact photonic devices using bent waveguides. This approach enables efficient light transfer and robust performance, offering shortcuts to adiabaticity.

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    Area of Science:

    • Photonics
    • Quantum Control
    • Waveguide Optics

    Background:

    • Adiabatic photonic devices are crucial for light manipulation.
    • Achieving adiabaticity often requires long device lengths.
    • Shortcuts to adiabaticity (STA) offer a way to speed up the process.

    Purpose of the Study:

    • To implement counter-diabatic (CD) driving in mode-evolution couplers using axis bending.
    • To develop a compact and robust method for photonic device design.
    • To validate the theoretical framework with numerical simulations.

    Main Methods:

    • Derivation of an analytical framework using coupled-mode theory.
    • Introduction of geometric deformation (axis bending) to realize the CD protocol.
    • Verification using Beam Propagation Method (BPM) simulations.

    Main Results:

    • Demonstrated complete light transfer in a 500 μm bent coupler.
    • Observed minimal nonadiabatic transitions, validating the CD driving.
    • Established deterministic design rules for bent waveguide systems.

    Conclusions:

    • Axis bending provides a feasible method for implementing CD driving in photonic couplers.
    • The approach enables compact, robust, and efficient photonic devices.
    • This work paves the way for robust shortcuts to adiabaticity photonic components.