On nonlinear evolution and supraluminal communication between finite   quantum systems
  We revise the 'no-signaling' condition for the supraluminal communication between two spatially separated finite quantum systems of arbitrary dimensions, thus generalizing a similar preceding approach for two-qubits: non-linear evolution does not necessarily imply the possibility of supraluminal communication between any sort of finite quantum systems. 
M. Ferrero, D. Salgado and J.L. Sanchez-Gomez