论文标题
工程多部分纠缠状态在双重泵送参数下转换过程中
Engineering multipartite entangled states in doubly pumped parametric down-conversion processes
论文作者
论文摘要
我们研究了由光学参数下转换产生的量子状态，以$χ^{（2）} $介质由两种非校准光模式驱动。该分析表明，在该过程产生的时空模式的子集中，多方的出现，即3-或4-Partite的纠缠状态。这些表现为在背景荧光上的明亮斑点，提供了与最近在二维非线性光子晶体中观察到的现象学的有趣类比。我们研究了两个现实的设置：i）在定期刺激的诱导锂平板中进行非临界相匹配，其特征是热点之间的3模式纠缠状态。 ii）在β-湾硼酸盐晶体中设置的I型设置，可以利用两个泵之间的空间散步，以过渡到四分之一的纠缠状态。在这两种情况下，我们都表明，可以通过调节两个泵波的相对强度来控制状态的特性，从而使设备成为量子状态工程的多功能工具。
We investigate the quantum state generated by optical parametric down-conversion in a $χ^{(2) } $ medium driven by two noncollinear light modes. The analysis shows the emergence of multipartite, namely 3- or 4-partite, entangled states in a subset of the spatio-temporal modes generated by the process. These appear as bright spots against the background fluorescence, providing an interesting analogy with the phenomenology recently observed in two-dimensional nonlinear photonic crystals. We study two realistic setups: i) Non-critical phase-matching in a periodically poled Lithium Tantalate slab, characterized by a 3-mode entangled state among hot spots. ii) A type I setup in a Beta-Barium Borate crystal, where the spatial walk-off between the two pumps can be exploited to make a transition to a quadripartite entangled state. In both cases we show that the properties of the state can be controlled by modulating the relative intensity of two pump waves, making the device a versatile tool for quantum state engineering.
