Dynamic Evolution of Open Spin Chain in Markovian Environment

There have been numerous researches on spin chain while most are gathered in the thermal entanglement or the intrinsic decoherence of spin chain, and only few papers investigate the spin chain under dephasing channel. Thus the dynamics of open spin chain in thermal noises is desiderated to research. In this paper, the entanglement dynamics induced by 2-qubit anisotropy Heisenberg model that each qubit coupled with reservoir is investigated. The corresponding master equation is analytically solved by the new Ket-Bra Entangled State (KBES) method with computer; The evolution of entanglement is also analyzed in detail when initial state is described by Extended Wenger-Like(EWL) state. It’s found that the spin coupling can lead to the revival of entanglement; Besides the fluctuation frequency show a positive correlation with the coupling coefficient. The most distinguished discovery is that the system still keep part entangled even for time tend to infinity, which imply that people can inhibit the disentanglement process by internal interaction of system.