Fidelity, entanglement, and information complementarity relation
  We investigate the dynamics of information in isolated multi-qubit systems. It is shown that information is in not only local form but also nonlocal form. We apply a measure of local information based on fidelity, and demonstrate that nonlocal information can be directly related to some appropriate well defined entanglement measures. Under general unitary transformations, local and nonlocal information will exhibit unambiguous complementary behavior with the total information conserved. 
Jian-Ming Cai, Zheng-Wei Zhou, and Guang-Can Guo