论文标题
非共线光学参数放大器中的时空纠缠
Spatiotemporal entanglement in a noncollinear optical parametric amplifier
论文作者
论文摘要
从理论上讲，我们在单频型I非共线频率退化参数下调的过程中，通过超短脉冲泵的形式研究了两个纠缠的光束。我们在数值和分析上都发现了生成场的时空挤压本征和相应的挤压特征值。通过在曲线坐标中通过高斯函数对场的关节光谱振幅进行建模来获得分析溶液。我们表明该方法效率高，并且与数值解决方案非常吻合。我们还揭示了当产生的梁的总带宽足够高时，模态函数不能分解为空间和时间部分，但是表现出时空耦合，可以通过缩短泵来提高强度。
We theoretically investigate the generation of two entangled beams of light in the process of single-pass type-I noncollinear frequency degenerate parametric downconversion with an ultrashort pulsed pump. We find the spatio-temporal squeezing eigenmodes and the corresponding squeezing eigenvalues of the generated field both numerically and analytically. The analytical solution is obtained by modeling the joint spectral amplitude of the field by a Gaussian function in curvilinear coordinates. We show that this method is highly efficient and is in a good agreement with the numerical solution. We also reveal that when the total bandwidth of the generated beams is sufficiently high, the modal functions cannot be factored into a spatial and a temporal parts, but exhibit a spatio-temporal coupling, whose strength can be increased by shortening the pump.
