%0 Journal Article %T Atom-Photon Thermal Entanglement in Nonlinear Jaynes-Cummings Models %J Iranian Journal of Science %I Springer %Z 2731-8095 %A Keshavarz, A. %A Golshan, M. M. %D 2011 %\ 09/16/2011 %V 35 %N 3 %P 217-222 %! Atom-Photon Thermal Entanglement in Nonlinear Jaynes-Cummings Models %K Thermal entanglement %K atom-photon %K nonlinear Jaynes-Cummings %R 10.22099/ijsts.2011.2145 %X In this work we investigate the thermal entanglement between two-level atoms and photons in a nonlinear cavity. We consider intensity-dependent couplings and calculate the negativity, as a measure of atom-photonentanglement. The cavity is assumed to be at a temperature T, so that all number of photons, and at the same time, both atomic states, with definite probabilities, are present. We then demonstrate a condition under which the intensity-dependent coupling leads to entanglement. It is also shown that, as in the case of linear Jaynes- Cummings model, the thermal states of atoms and photons are never separable. %U https://ijsts.shirazu.ac.ir/article_2145_23f4a1b04ffa80c9e5a9e36cbe6e2175.pdf