Imaging and certifying high-dimensional entanglement with a single-photon avalanche diode camera
Imaging and certifying high-dimensional entanglement with a single-photon avalanche diode camera
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DOI：
10.1038/s41534-020-00324-8
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发表时间：
2020-12-04
影响因子：
7.6
通讯作者：
Faccio, Daniele
中科院分区：
文献类型：
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作者：
Ndagano, Bienvenu;Defienne, Hugo;Faccio, Daniele
两个光子之间的空间相关性是实现许多量子成像方案的关键资源。双光子相关图的测量通常使用基于电荷耦合器件（CCD）技术的单点扫描探测器或单光子相机进行。然而，由于 CCD 相机的扫描速度慢且帧速率低，这两种方法的速度都受到限制，导致数据采集时间长达数小时。在这里，我们采用高帧率单光子雪崩二极管 (SPAD) 相机来测量自发参数下转换产生的双光子态的空间联合概率分布，并在 10(7) 帧上进行统计。通过违反爱因斯坦-波多尔斯基-罗森准则 227 西格玛，我们确认了光子对之间存在空间纠缠。此外，我们在短短 140 秒内证明了纠缠维数为 48。我们的工作展示了 SPAD 相机在快速表征光子纠缠方面的潜力，引领了实时量子成像和量子信息处理的道路。
Spatial correlations between two photons are the key resource in realising many quantum imaging schemes. Measurement of the bi-photon correlation map is typically performed using single-point scanning detectors or single-photon cameras based on charged coupled device (CCD) technology. However, both approaches are limited in speed due to the slow scanning and the low frame rate of CCD-based cameras, resulting in data acquisition times on the order of many hours. Here, we employ a high frame rate, single-photon avalanche diode (SPAD) camera, to measure the spatial joint probability distribution of a bi-photon state produced by spontaneous parametric down-conversion, with statistics taken over 10(7) frames. Through violation of an Einstein-Podolsky-Rosen criterion by 227 sigmas, we confirm the presence of spatial entanglement between our photon pairs. Furthermore, we certify, in just 140s, an entanglement dimensionality of 48. Our work demonstrates the potential of SPAD cameras in the rapid characterisation of photonic entanglement, leading the way towards real-time quantum imaging and quantum information processing.