Jensen Shannon divergence as a measure of the degree of entanglement
  The notion of distance in Hilbert space is relevant in many scenarios. In particular, distances between quantum states play a central role in quantum information theory. An appropriate measure of distance is the quantum Jensen Shannon divergence (QJSD) between quantum states. Here we study this distance as a geometrical measure of entanglement and apply it to different families of states. 
A.P. Majtey, A. Borras, M. Casas, P.W. Lamberti, A. Plastino