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    Area of Science:

    • Quantum mechanics
    • Quantum optics
    • Optomechanics

    Background:

    • Macroscopic Schrödinger cat states are crucial nonclassical states but are highly susceptible to decoherence.
    • Swapping these delicate quantum states is a significant challenge in quantum information processing.

    Purpose of the Study:

    • To propose a reliable scheme for swapping macroscopic Schrödinger cat states.
    • To suppress decoherence effects during the state swapping process in an optomechanical system.

    Main Methods:

    • Utilized a feedback-controlled optomechanical system comprising an optical cavity and two mechanical oscillators.
    • Implemented a three-step protocol: squeezing the initial cat state, indirect interaction for state swapping, and antisqueezing to obtain the target state.
    • Simulated the state transfer dynamics and analyzed the influence of squeezed parameters.

    Main Results:

    • Demonstrated a feasible and effective protocol for swapping macroscopic Schrödinger cat states.
    • Showcased significant suppression of decoherence effects through numerical and analytical simulations.
    • Confirmed the protocol's superior performance in maintaining quantum state fidelity.

    Conclusions:

    • The proposed state swapping scheme is effective and feasible for macroscopic Schrödinger cat states.
    • The method offers a promising approach to combat decoherence in quantum systems.
    • This work advances the potential for robust quantum state manipulation in optomechanical setups.