多光子Bell型不等式：揭示连续变量量子光学系统非定域性的工具
Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
摘要：
考虑一个多光子Bell型不等式来研究四模连续变量系统的非定域性，它不仅适用于双光子态，而且适用于混合态以及光子数起伏的态.我们将不等式应用到各种各样的状态，如纯高斯态和混合高斯态（包括压缩热态）和非高斯态。我们考虑分束器作为泄漏的模型，并表明该不等式能够检测噪声高斯态的非经典性。最后，我们研究了非经典、非高斯态的典型例子--成对相干态和纠缠相干态的非局域性。
英文摘要：
We consider a multiphoton Bell-type inequality to study nonlocality in four-mode continuous variable systems, which goes beyond two-photon states and can be applied to mixed as well as states with fluctuating photon number. We apply the inequality to a wide variety of states such as pure and mixed Gaussian states (including squeezed thermal states) and non-Gaussian states. We consider beam splitters as a model for leakage and show that the inequality is able to detect nonclassicality of noisy Gaussian states as well. Finally, we investigate nonlocality in pair-coherent states and entangled coherent states, which are prominent examples of nonclassical, non-Gaussian states.
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