Steady-State Entanglement for Distant Atoms by Dissipation in Coupled   Cavities
  We propose a scheme for the generation of entangled states for two atoms trapped in separate cavities coupled to each other. The scheme is based on the competition between the unitary dynamics induced by the classical fields and the collective decays induced by the dissipation of two delocalized field modes. Under certain conditions, the symmetric or asymmetric entangled state is produced in the steady state. The analytical result shows that the distributed steady entanglement can be achieved with high fidelity independent of the initial state, and is robust against parameter fluctuations. We also find out that the linear scaling of $F$ has a quadratic improvement compared to distributed entangled state preparation protocols based on unitary dynamics. 
Li-Tuo Shen, Xin-Yu Chen, Zhen-Biao Yang, Huai-Zhi Wu, and Shi-Biao   Zheng
quant-ph