In this work we review the entire classification of 2x2 distillable states for protocols with a finite numbers of copies. We show a distillation protocol that allows to distill Bell states with non zero probability at any time for an initial singlet in vacuum. It is shown that the same protocol used in non zero thermal baths yields a considerable recovering of entanglement.
@article{arxiv.0908.2142,
title = {Distillation of Bell states in open systems},
author = {E. Isasi and D. Mundarain},
journal= {arXiv preprint arXiv:0908.2142},
year = {2015}
}