The Shannon-McMillan Theorem for Ergodic Quantum Lattice Systems
  We formulate and prove a quantum Shannon-McMillan theorem. The theorem demonstrates the significance of the von Neumann entropy for translation invariant ergodic quantum spin systems on n-dimensional lattices: the entropy gives the logarithm of the essential number of eigenvectors of the system on large boxes. The one-dimensional case covers quantum information sources and is basic for coding theorems. 
Igor Bjelakovic, Tyll Krueger, Rainer Siegmund-Schultze, Arleta Szkola