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Robust coherent control in three-level quantum systems using composite pulses.

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    Composite pulses, specifically composite adiabatic passage (CAP), enhance quantum control robustness and fidelity in three-level systems. CAP demonstrates superior performance against errors, achieving over 99.9% efficiency for precise quantum state manipulation.

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    Area of Science:

    • Quantum Information Science
    • Quantum Control
    • Atomic, Molecular, and Optical (AMO) Physics

    Background:

    • Accurate manipulation of quantum states is crucial for quantum technologies.
    • Three-level quantum systems are fundamental building blocks in various quantum applications.
    • Coherent control techniques are essential for high-fidelity quantum state manipulation.

    Purpose of the Study:

    • To investigate the use of composite pulses for robust and high-fidelity coherent control.
    • To design dynamic parameters for three-level Hamiltonians using established control techniques.
    • To compare the performance of different control techniques against systematic errors.

    Main Methods:

    • Design of dynamic parameters (Rabi frequency and detuning) for three-level Hamiltonians.
    • Implementation of five well-known coherent control techniques, including composite adiabatic passage (CAP).
    • Comparative analysis of technique performance against Rabi frequency and systematic errors.

    Main Results:

    • Composite adiabatic passage (CAP) demonstrated the highest robustness against systematic errors.
    • CAP achieved high efficiencies exceeding 99.9% across a broad range of parameters.
    • Other coherent control techniques showed lower robustness compared to CAP.

    Conclusions:

    • Composite pulses, particularly CAP, offer a robust and accurate method for quantum state control.
    • CAP is highly effective for manipulating quantum state evolution in three-level systems.
    • The findings provide a pathway for enhanced precision in quantum information processing.