Gómez E S, Riquelme P, Solís-Prosser M A, González P, Ortega E, Xavier G B, Lima G
Opt Express. 2018 May 28;26(11):13961-13972. doi: 10.1364/OE.26.013961.
We report on a new technique for entanglement distillation of the bipartite continuous variable state of spatially correlated photons generated in the spontaneous parametric down-conversion process (SPDC), where tunable non-Gaussian operations are implemented and the post-processed entanglement is certified in real-time using a single-photon sensitive electron multiplying CCD (EMCCD) camera. The local operations are performed using non-Gaussian filters modulated into a programmable spatial light modulator and, by using the EMCCD camera for actively recording the probability distributions of the twin-photons, one has fine control of the Schmidt number of the distilled state. We show that even simple non-Gaussian filters can be finely tuned to a ∼67% net gain of the initial entanglement generated in the SPDC process.
我们报道了一种用于纠缠提纯的新技术，该技术针对自发参量下转换过程（SPDC）中产生的空间关联光子的二分连续变量态，其中实现了可调谐的非高斯操作，并使用单光子敏感的电子倍增电荷耦合器件（EMCCD）相机实时验证后处理的纠缠。局部操作通过调制到可编程空间光调制器中的非高斯滤波器来执行，并且通过使用EMCCD相机主动记录双光子的概率分布，可以对提纯态的施密特数进行精细控制。我们表明，即使是简单的非高斯滤波器也可以精细调整，以实现SPDC过程中产生的初始纠缠约67%的净增益。
