Entanglement dynamics of a three-qubit system interacting with a quantum spin environment

Wei investigate the entanglement dynamics and decoherence of a three-qubit system under a quantum spin environment at a finite temperature in the thermodynamics limit. For the case under study, we find the evolution of pairwise entanglement depends not only oil the initial states but also oil the parameters related to the system and the spin environment. In addition, all undesirable entanglement Sudden death occurs in the process of entanglement evolution, and this effect can be controlled by the coupling Constant between two qubits, external magnetic field, and the interaction between the system and the environment. (C) 2009 Elsevier B.V. All rights reserved.