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Mechanical squeezing in an active-passive-coupled double-cavity optomechanical system via pump modulation.

Qi Guo, Xiao-Qiao Ren, Cheng-Hua Bai

    Optics Express
    |December 23, 2022
    PubMed
    Summary

    We demonstrate enhanced mechanical squeezing in a parity-time (PT)-symmetric optomechanical system. This PT-symmetric system shows improved robustness against noise and can surpass the 3 dB limit for quantum squeezing.

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    Area of Science:

    • Quantum Optics
    • Optomechanics
    • Quantum Information Science

    Background:

    • Optomechanical systems are crucial for studying quantum phenomena.
    • Parity-time (PT)-symmetry offers unique properties in coupled systems.
    • Generating robust mechanical squeezing is vital for quantum technologies.

    Purpose of the Study:

    • To investigate mechanical squeezing generation in a PT-symmetric active-passive coupled optomechanical system.
    • To analyze the stability and robustness of the system against thermal noise.
    • To explore the potential for surpassing the 3 dB squeezing limit.

    Main Methods:

    • Utilizing a periodically amplitude-modulated laser to drive the optomechanical system.
    • Numerical analysis to determine system stability in different PT-symmetry regimes (unbroken and broken).
    • Comparing squeezing performance in active-passive versus passive-passive configurations.

    Main Results:

    • The system exhibits greater stability in the unbroken PT-symmetry regime.
    • Mechanical squeezing in the active-passive system is more robust to thermal noise than in passive-passive systems.
    • The 3 dB squeezing limit can be overcome in the resolved-sideband regime.
    • Stronger mechanical squeezing is achieved in the unbroken PT-symmetry region.

    Conclusions:

    • PT-symmetric optomechanical systems offer enhanced and robust mechanical squeezing.
    • This work contributes to quantum state engineering and the study of PT-symmetric physics in quantum regimes.
    • The findings have implications for developing advanced quantum technologies.