Quantum error avoiding codes versus quantum error correcting codes
  A general theory of quantum error avoiding codes is established, and new light is shed on the relation between quantum error avoiding and correcting codes. Quantum error avoiding codes are found to be a special type of highly degenerate quantum error correcting codes. A combination of the ideas of correcting and avoiding quantum errors may yield better codes. We give a practical example. 
Lu-Ming Duan and Guang-Can Guo (University of Science and Technology   of China)