A New Protocol of Continuous-Variable Entanglement Distillation
  We introduce a new protocol in continuous variable entanglement distillation that requires only linear temporal and constant physical or spatial resources.Compared with the existing protocols, our protocol uses atom-photon entanglement to substitute for atom-atom entanglement in existing protol, which will not only save the number of quantum memories, but also has the advantages in operation efficiency and temporal saving. The distillation can be realized by a fixed model of iterations, in which only three quantum memories and photon detectors are required. 
Shi Jin, Xian-Min Jin, Joshua Nunn, Animesh Datta, Ian Walmsley
quant-ph