Coherent states are normally used to describe the state of a laser field in experiments that generate and detect squeezed states of light. Nevertheless, since the laser field absolute phase is unknown, its quantum state can be described by a statistical mixture of coherent states with random phases, which is equivalent to a statistical mixture of Fock states. Here we describe single-mode squeezed vacuum experiments using this mixed quantum state for the laser field. Representing the laser state in the Fock basis, we predict the usual experimental results without using the squeezing concept in the analysis and concluding that no squeezed state is generated in the experiments. We provide a general physical explanation for the noise reduction in the experiments in terms of a better definition of the relative phase between the signal and local oscillator fields. This explanation is valid in any description of the laser field (in terms of coherent or Fock states), thus providing a deeper understanding of the phenomenon.

中文翻译：

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描述没有压缩光状态的压缩光实验

在产生和检测光的压缩状态的实验中，相干状态通常用于描述激光场的状态。然而，由于激光场的绝对相位是未知的，其量子态可以用相干态与随机相位的统计混合来描述，这等效于Fock态的统计混合。在这里，我们描述了使用这种混合量子态的激光场的单模压缩真空实验。以Fock为基础表示激光状态，我们可以在不使用压缩概念的情况下预测通常的实验结果，并得出在实验中不会产生压缩状态的结论。我们通过更好地定义信号和本地振荡器场之间的相对相位，为实验中的降噪提供了一般的物理解释。该解释在对激光场的任何描述中（在相干或福克状态方面）都是有效的，因此可以提供对该现象的更深入的了解。