Entanglement dynamics of W-like states within the framework of triple Jaynes-Cummings model

Entanglement dynamics of two atomic W-like states is studied within the framework of a triple Jaynes-Cummings model. It is shown that the two states, though initially being equivalent under simple local operations and thus having the same amounts of pairwise entanglements, undergo qualitatively different evolutions. Namely, one of them may suffer from the so-called entanglement sudden death depending on the parameters, while the other one does not for whatever parameters.