When photons impinge on a material, free electrons can be created by the photoelectric effect. The emitted electron current usually fluctuates with Poisson statistics, but if squeezed quantum light is applied, the electrons bunch up.

中文翻译：

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电子在量子光中聚集

当光子撞击材料时，光电效应可以产生自由电子。发射的电子电流通常随泊松统计波动，但如果应用压缩量子光，电子就会聚集起来。