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Counterdiabatic mode-evolution based coupled-waveguide devices.

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    We developed a universal method for designing short, high-fidelity quantum devices using coupled waveguides. This approach adapts counterdiabatic protocols, ensuring precise mode evolution even under non-ideal conditions.

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    Area of Science:

    • Quantum optics
    • Integrated photonics
    • Quantum control

    Background:

    • Designing mode-evolution based devices requires achieving short component lengths and high fidelity.
    • Counterdiabatic protocols in quantum state control can suppress unwanted mode coupling but are challenging to implement in coupled-waveguide systems.

    Purpose of the Study:

    • To derive a universal formalism for designing short and high-fidelity mode-evolution based coupled-waveguide devices.
    • To adapt counterdiabatic protocols for direct application in coupled-waveguide systems.

    Main Methods:

    • Derived alternative coupled-mode equations linked to the counterdiabatic protocol's dynamical equation via unitary transformations.
    • Employed a universal formalism for designing coupled-waveguide devices.
    • Performed tolerance analysis on the designed devices.

    Main Results:

    • Developed a universal formalism for designing short and high-fidelity mode-evolution based coupled-waveguide devices.
    • Counterdiabatic protocols enable high-fidelity devices that precisely follow adiabatic modes, even when adiabatic conditions are violated.
    • Counter-diabatic devices exhibit advantages of both adiabatic and resonant devices, confirmed by tolerance analysis.

    Conclusions:

    • The derived formalism provides a pathway for realizing high-fidelity, short mode-evolution based devices in coupled-waveguide systems.
    • The method successfully designs asymmetric waveguide couplers, demonstrating practical applicability.
    • This work offers a significant advancement in the design of quantum coherent control devices.