Iterative entanglement distillation for finite resources
  We discuss a specific entanglement distillation scheme under the constraint of finite samples of entangled qubit pairs. It is shown that an iterative process can be explicitly formulated. The average fidelity of this process can be enhanced by introducing conditional storing of entangled qubit pairs in each step of the iteration. We investigate the corresponding limitations on the size and the initial fidelity of the sample. 
Stefan Probst-Schendzielorz, Thorsten Bschorr, and Matthias Freyberger