Atomic entanglement sudden death in a strongly driven cavity QED system
  We study the entanglement dynamics of strongly driven atoms off-resonantly coupled with cavity fields. We consider conditions characterized not only by the atom-field coupling but also by the atom-field detuning. By studying two different models within the framework of cavity QED, we show that the so-called atomic entanglement sudden death (ESD) always occurs if the atom-field coupling lager than the atom-field detuning, and is independent of the type of initial atomic state. 
Ying-Jie Zhang, Zhong-Xiao Man, Yun-Jie Xia