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J. Phys. B: At. Mol. Opt. Phys. 41, 085503 (6pp) (2008)


On conditions for atomic entanglement sudden death in cavity QED

Zhong-Xiao Man, Yun-Jie Xia, and N. B. An

In this paper, we study the entanglement dynamics of atoms coupled to cavity fields. We consider conditions characterized not only by the purity of the atomic initial state but also by the cavity photon number. By studying three different models within the framework of cavity QED, we show that the so-called atomic entanglement sudden death always occurs if initially the atomic state is sufficiently impure and/or the cavity photon number is nonzero.