When a laser beam is incident on a double-slit interferometer without turbulence, the classic Young’s double-slit interference is present in the first-order measurement of the mean photon number (or intensity), while the second-order measurement of photon number fluctuation correlation (or intensity fluctuation correlation) yields a trivial constant. When optical turbulence is introduced, it destroys the classic interference present in the measurement of the photon number; however, two-photon interference appears in the measurement of photon number fluctuation correlation. This interesting observation means that the observed two-photon interference is not only observable through turbulence, i.e., turbulence-free, but also induced by the turbulence itself. Turbulence-free two-photon interference induced by the turbulence itself allows for interferometric sensing through strong turbulence when coherent radiation, such as a laser, is applied.

中文翻译：

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湍流本身引起的无湍流干扰

当激光束在没有湍流的情况下入射到双缝干涉仪上时，经典的杨氏双缝干涉出现在平均光子数（或强度）的一阶测量中，而对光子数波动的二阶测量中相关性（或强度波动相关性）产生一个琐碎的常数。当引入光学湍流时，它会破坏光子数测量中存在的经典干扰。但是，在测量光子数波动相关性时会出现两光子干扰。这种有趣的观察意味着观察到的双光子干涉不仅可以通过湍流（即无湍流）观察到，而且可以通过受湍流本身的影响。当应用相干辐射（例如激光）时，由湍流本身引起的无湍流的双光子干涉允许通过强湍流进行干涉感测。