Moreau Paul-Antoine, Devaux Fabrice, Lantz Eric
Département d'Optique, Institut FEMTO-ST, Université de Franche-Comté, CNRS, 25000 Besançon, France.
Phys Rev Lett. 2014 Oct 17;113(16):160401. doi: 10.1103/PhysRevLett.113.160401. Epub 2014 Oct 14.
Spatially entangled twin photons provide both promising resources for modern quantum information protocols, because of the high dimensionality of transverse entanglement, and a test of the Einstein-Podolsky-Rosen paradox in its original form of position versus impulsion. Usually, photons in temporal coincidence are selected and their positions recorded, resulting in a priori assumptions on their spatiotemporal behavior. In this Letter, we record, on two separate electron-multiplying charge coupled devices cameras, twin images of the entire flux of spontaneous down-conversion. This ensures a strict equivalence between the subsystems corresponding to the detection of either position (image or near-field plane) or momentum (Fourier or far-field plane). We report the highest degree of paradox ever reported and show that this degree corresponds to the number of independent degrees of freedom, or resolution cells, of the images.
空间纠缠的双光子既为现代量子信息协议提供了有前景的资源，这得益于横向纠缠的高维性，也为爱因斯坦 - 波多尔斯基 - 罗森佯谬提供了以位置与动量的原始形式进行的检验。通常，会选择时间上符合的光子并记录它们的位置，这就导致了对其时空行为的先验假设。在本信函中，我们在两个独立的电子倍增电荷耦合器件相机上记录了自发参量下转换的整个光通量的孪生图像。这确保了在对应于位置（图像或近场平面）或动量（傅里叶或远场平面）检测的子系统之间具有严格的等效性。我们报告了迄今所报道的最高程度的佯谬，并表明这一程度对应于图像的独立自由度数量或分辨率单元数量。
