Entanglement and Berry Phase in Two Interacting Qubits
  Entanglement and Berry phase are investigated in two interacting qubit systems. The XXZ spin interaction model with a slowly rotating magnetic field is employed for the interaction between the two qubits. We show how the anisotropy of interaction reveals unique relations between the Berry phases and the entanglements for the eigenstates of the system. 
Ai Min Chen, Sam Young Cho, and Taeseung Choi