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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Strong single-photon optomechanical coupling in a hybrid quantum system.

Jiaojiao Chen, Zhuanxia Li, Xiao-Qing Luo

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    This study proposes a hybrid quantum system to enhance single-photon optomechanical couplings. The novel approach significantly boosts lower-branch polariton (LBP) cavity coupling, enabling exploration of quantum nonlinear effects.

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    Area of Science:

    • Quantum physics
    • Optomechanics
    • Hybrid quantum systems

    Background:

    • Strong single-photon optomechanical couplings are essential for advancing optomechanical systems.
    • Previous schemes using two harmonic oscillators faced limitations with coupling strength conditions.

    Purpose of the Study:

    • To propose a novel hybrid quantum system for enhanced optomechanical couplings.
    • To overcome limitations in existing optomechanical coupling schemes.
    • To enable the study of quantum nonlinear and nonclassical effects.

    Main Methods:

    • A hybrid quantum system combining a nanobeam (phonons), a spin ensemble, and a cavity (photons).
    • Utilizing the critical properties of the lower-branch polariton (LBP) formed by ensemble-phonon interaction.
    • Suppressing upper-branch polariton (UBP)-cavity coupling.

    Main Results:

    • Achieved a three-orders-of-magnitude enhancement in LBP-cavity coupling.
    • Fully suppressed UBP-cavity coupling.
    • Overcame the previous limitation of coupling strength being less than the critical value.
    • Induced a strong Kerr effect.

    Conclusions:

    • The proposed system significantly enhances optomechanical coupling, overcoming previous limitations.
    • The approach facilitates the study of quantum nonlinear and nonclassical phenomena.
    • This work offers a new pathway for exploring weakly coupled optomechanical systems.