论文标题
热双向
Thermal biphotons
论文作者
论文摘要
汉伯里棕色和Twiss（HBT）效果的观察带有量子光学的诞生。迄今为止，所有所考虑的热源都没有光的量子特征，因为它们由发射不相关光子的独立发射器组成。在这里，我们提出并演示了基于相框的空间纠缠光子的不连贯的光源，我们将其汇合了热双音。我们表明，与热光相比，热双孔的HBT峰的宽度取决于它们的相关性，从而违反了siegert的关系和斑点 - 触发器解释的分解。我们通过在光的效果和相干反向散射之间建立联系，进一步提供了对结果的替代解释。最后，我们讨论了空间纠缠在观察到的结果中的作用，从而得出了施密特数量和在自发参数降低转换（SPDC）的双高斯近似值下的schmidt数量与违反西格特关系的关系。我们的工作反映了在纠缠存在下热光的相干性能的新见解，为使用平均测量值的纠缠认证铺平了道路。
The observation of the Hanbury Brown and Twiss (HBT) effect with thermal light marked the birth of quantum optics. All the thermal sources considered to date did not feature quantum signatures of light, as they consisted of independent emitters that emit uncorrelated photons. Here, we propose and demonstrate an incoherent light source based on phase-randomized spatially entangled photons, which we coin thermal biphotons. We show that in contrast to thermal light, the width of the HBT peak for thermal biphotons is determined by their correlations, leading to violation of the Siegert relation and breakdown of the speckle-fluctuations interpretation. We further provide an alternative interpretation of the results by drawing a connection between the HBT effect and coherent backscattering of light. Finally, we discuss the role of spatial entanglement in the observed results, deriving a relation between the Schmidt number and the degree of violation of the Siegert relation under the double-Gaussian approximation of spontaneous parametric down conversion (SPDC). Our work reflects new insights on the coherence properties of thermal light in the presence of entanglement, paving the way for entanglement certification using disorder averaged measurements.
