论文标题
自发参数下转换中时空双足状态的一般描述
Generalized description of the spatio-temporal biphoton State in spontaneous parametric down-conversion
论文作者
论文摘要
自发参数下转换（SPDC）是一个广泛用于光子纠缠的来源。多年的重点研究已经使人们对这一过程有了牢固的了解，但是对近距离双风状态的凝聚力分析描述尚未实现。我们得出了时空双孔状态的一般表达，该状态普遍应用在共同的实验环境中，并正确地描述了空间和光谱模式的不可分割性。我们通过考虑相互作用的光束相互作用阶段来降低光谱自由度的空间耦合的标准。这项工作提供了有关GOUY阶段在SPDC中的作用的新见解，也为用于多维量子信息处理的工程纠缠状态的准备。
Spontaneous parametric down-conversion (SPDC) is a widely used source for photonic entanglement. Years of focused research have led to a solid understanding of the process, but a cohesive analytical description of the paraxial biphoton state has yet to be achieved. We derive a general expression for the spatio-temporal biphoton state that applies universally across common experimental settings and correctly describes the non-separability of spatial and spectral modes. We formulate a criterion on how to decrease the coupling of the spatial from the spectral degree of freedom by taking into account the Gouy phase of interacting beams. This work provides new insights into the role of the Gouy phase in SPDC, and also into the preparation of engineered entangled states for multidimensional quantum information processing.
