Influence of pump coherence on the generation of position-momentum entanglement in optical parametric down-conversion.
Influence of pump coherence on the generation of position-momentum entanglement in optical parametric down-conversion.
复制标题
泵浦相干性对光学参量下转换中位置动量纠缠产生的影响。
DOI：
10.1364/oe.27.020745
复制
发表时间：
2018
期刊：
影响因子：
3.8
通讯作者：
R. Boyd
中科院分区：
文献类型：
--
作者：
Wuhong Zhang;R. Fickler;E. Giese;Lixiang Chen;R. Boyd
我们通过实验研究了光子对的位置动量纠缠程度如何取决于在自发参数下转换过程中激发光子的泵浦光束的横向相干性。利用来自发光二极管的空间非相干光，我们获得了光子的强位置相关性，但我们发现横向动量相关性以及由此产生的纠缠完全不存在。当我们不断改变泵浦光束的空间相干程度时，我们观察到更强的动量相关性和纠缠的出现。我们提出理论论据来解释我们的实验结果。我们的结果揭示了纠缠的产生，可用于控制量子信息应用的纠缠。
We examine experimentally how the degree of position-momentum entanglement of photon pairs depends on the transverse coherence of the pump beam that excites them in a process of spontaneous parametric down-conversion. Using spatially incoherent light from a light-emitting diode, we obtain strong position correlation of the photons, but we find that transverse momentum correlation, and thus entanglement, is entirely absent. When we continuously vary the degree of spatial coherence on the pump beam, we observe the emergence of stronger momentum correlations and entanglement. We present theoretical arguments that explain our experimental results. Our results shed light on entanglement generation and can be applied to control entanglement for quantum information applications.