Minimax discrimination of two Pauli channels
  We consider the problem of optimally discriminating two Pauli channels in the minimax strategy, maximizing the smallest of the probabilities of correct identification of the channel. We find the optimal input state at the channel and show the conditions under which using entanglement strictly enhances distinguishability. We finally compare the minimax strategy with the Bayesian one. 
G. Mauro D'Ariano, Massimiliano F. Sacchi, Jonas Kahn