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.
@article{arxiv.1805.06577,
title = {Tunable entanglement distillation of spatially correlated down-converted photons},
author = {E. S. Gómez and P. Riquelme and M. A. Solis-Prosser and P. González and E. Ortega and G. B. Xavier and G. Lima},
journal= {arXiv preprint arXiv:1805.06577},
year = {2018}
}