论文标题
与不连贯的照明促进纠缠产生
Boosting entanglement generation in down-conversion with incoherent illumination
论文作者
论文摘要
自发参数下转换产生的纠缠光子对于我们当前对量子力学和量子信息进展的理解至关重要。在此过程中，下转换光子的量子相关性受泵梁照明非线性晶体的光学特性的控制。广泛地，泵梁是通过相干梁或众所周知的高斯 - 切尔模型对泵束建模的，这得出了自然的结论，即产生高度纠缠的状态需要高度的光学连贯性。在这里，我们表明，当考虑了一类新型相干的高斯泵梁时，可以生成一种独特的量子状态，纠缠的量与泵梁的一致性成反比。这导致高度不连贯但高度纠缠的多光子状态，这应该对光子量子信息科学产生有趣的后果。
Entangled photons produced by spontaneous parametric down-conversion have been of paramount importance for our current understanding of quantum mechanics and advances in quantum information. In this process, the quantum correlations of the down-converted photons are governed by the optical properties of the pump beam illuminating the non-linear crystal. Extensively, the pump beam has been modeled by either coherent beams or by the well-know Gaussian-Schell model, which leads to the natural conclusion that a high degree of optical coherence is required for the generation of highly entangled states. Here, we show that when a novel class of partially coherent Gaussian pump beams is considered, a distinct type of quantum state can be generated for which the amount of entanglement increases inversely with the degree of coherence of the pump beam. This leads to highly incoherent yet highly entangled multi-photon states, which should have interesting consequences for photonic quantum information science.
