论文标题
热点和增益增强在双重泵送的参数下转换过程中
Hot-spots and gain enhancement in a doubly pumped parametric down-conversion process
论文作者
论文摘要
我们在非线性散装晶体中实验研究了参数下转换过程，这是由两个非电视泵模式驱动的。该实验显示了两个泵共享的亮热点的出现，这与最近在2D非线性光子晶体中观察到的现象学类似。通过利用两种非凡泵模式之间的空间散步，我们已经能够重新创建特殊的共振条件，这是通过局部增强参数增益报告的，这对应于从三模式到四模式耦合的过渡。从量子的角度来看，这开辟了一种在简单的散装非线性源中的多模纠缠状态（例如三方或四方状态）的方式。
We experimentally investigate the parametric down-conversion process in a nonlinear bulk crystal, driven by two non-collinear pump modes. The experiment shows the emergence of bright hot-spots in modes shared by the two pumps, in analogy with the phenomenology recently observed in 2D nonlinear photonic crystals. By exploiting the spatial walk-off between the two extraordinary pump modes we have been able to recreate a peculiar resonance condition, reported by a local enhancement of the parametric gain, which corresponds to a transition from a three-mode to a four-mode coupling. From a quantum point of view this opens the way to the generation of multimode entangled states of light such as tripartite or quadripartite states, in simple bulk nonlinear sources.
