Influence of Intrinsic Decoherence on Entanglement in Two-Qubit QuantumHeisenberg XYZ Chain**The project supported by National Natural ScienceFoundation of China under Grant No. 10374007.

Abstract

Taking the intrinsic decoherence effect into account, we investigate thetime evolution of entanglement for two-qubit XYZ Heisenberg model in an externaluniform magnetic field. Concurrence, the measurement of entanglement, is calculated.We show how the intrinsic decoherence modifies the time evolution of the entanglementand find that at short-time case, concurrence is oscillating as increasing magneticfield, which implies that entanglement may be enhanced or weakenedin some time regions.