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  11. Ultra-low-noise Phase Gate And Squeezed State Rotation In A Gain-and-loss-balanced Coherently Prepared Atomic Medium

Ultra-low-noise phase gate and squeezed state rotation in a gain-and-loss-balanced coherently prepared atomic medium

H J Luo, J Guan, C J Zhu

    Optics Express
    |June 14, 2025

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    View abstract on PubMed

    Summary
    This summary is machine-generated.

    Researchers propose a new method for ultra-low-noise quantum phase gates and squeezed state rotations using atomic media. This approach significantly suppresses noise and enables high-fidelity quantum operations for quantum information processing.

    Area of Science:

    • Quantum Optics
    • Quantum Information Science
    • Atomic Physics

    Background:

    • Achieving ultra-low-noise quantum phase gates and squeezed state rotations is crucial for advancing quantum technologies.
    • Existing methods often face challenges with noise and fidelity in quantum operations.

    Purpose of the Study:

    • To theoretically propose a novel method for ultra-low-noise quantum phase gates and squeezed state rotations.
    • To investigate the noise suppression mechanisms in a coherently prepared atomic medium.
    • To demonstrate the potential for high-fidelity quantum operations and state manipulation.

    Main Methods:

    • Theoretical modeling of a coherently prepared atomic medium.
    • Analysis of balanced loss and gain mechanisms over a broad frequency range.

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  • Investigation of optical Kerr nonlinearity for quantum phase gate implementation.
  • Simulation of squeezed state rotation using a squeezed probe field.

    • Main Results:

    • Demonstrated balanced loss and gain in the atomic system, significantly suppressing Raman gain noise.
    • Showcased strong optical Kerr nonlinearity enabling high-fidelity π-phase gate operations.
    • Confirmed the ability to perform a $90^\circ$ rotation on squeezed states of nonclassical fields.

    Conclusions:

    • The proposed method offers a pathway to ultra-low-noise quantum operations.
    • Gain-and-loss-balanced coherently prepared atomic media exhibit unique properties beneficial for quantum information processing.
    • Findings pave the way for advancements in quantum metrology and information processing applications.