We experimentally demonstrate entanglement distillation of the two mode squeezed state. Applying the annihilation operator to both modes, we increase the fraction of the two-photon component in the state, resulting in the increase of both squeezing and entanglement by about 50%.
@article{arxiv.1307.3397,
title = {Distillation of the two-mode squeezed state},
author = {Yuri Kurochkin and Adarsh S. Prasad and A. I. Lvovsky},
journal= {arXiv preprint arXiv:1307.3397},
year = {2014}
}