Entanglement in the scattering process by local impurity
  We study entanglement in the scattering processes by fixed impurity and Kondo impurity. The fixed impurity plays a role as spin state filter that is employed to concentrate entanglement between the scattering particle and the unscattering particle. One Kondo impurity can entangle two noninteracting scattering particles while one scattering particle can entangle two separate noninteracting Kondo impurities. 
Dong Yang, Shi-Jian Gu, and Haibin Li