论文标题
描述没有挤压状态的挤压光实验
Describing squeezed-light experiments without squeezed-light states
论文作者
论文摘要
相干状态通常用于描述产生和检测光线挤压状态的实验中激光场的状态。然而，由于激光场绝对相尚不清楚，因此可以通过具有随机相的相干状态的统计混合物来描述其量子状态，这相当于Fock状态的统计混合物。在这里，我们描述了使用该混合量子态在激光场中挤压真空实验。在Fock的基础上代表激光状态，我们预测了通常的实验结果，而无需在分析中使用挤压概念并得出结论，并且在实验中没有产生挤压状态。我们提供了一个普遍的物理解释，以更好地定义信号和局部振荡器场之间的相对相位的更好的定义。这种解释在对激光领域的任何描述中都是有效的（就相干或fock状态而言），因此对现象有了更深入的了解。
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.
