Three-body entanglement induced by spontaneous emission in a three two-level atoms system

We study three-body entanglement induced by spontaneousemission in a three two-level atoms system by using the entanglementtensor approach. The results show that the amount of entanglementis strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherentsuperposition of the two-body entanglements. The larger thetwo-body entanglement is, the stronger the three-body entanglementis. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak.We also find that the maximum of the two-body entanglementobtained with nonidentical atoms is greater than that obtainedwith identical atoms via adjusting the difference in atomic frequency.