Quantum Zero-error Capacity
  We define here a new kind of quantum channel capacity by extending the concept of zero-error capacity for a noisy quantum channel. The necessary requirement for which a quantum channel has zero-error capacity greater than zero is given. Finally, we point out some directions on how to calculate the zero-error capacity of such channels. 
Rex A. C. Medeiros (UCG Brazil), Francisco M. De Assis (UCG Brazil)