Macroscopic thermal entanglement due to radiation pressure
  Can entanglement and the quantum behavior in physical systems survive at arbitrary high temperatures? In this Letter we show that this is the case for a electromagnetic field mode in an optical cavity with a movable mirror in a thermal state. We also identify two different dynamical regimes of generation of entanglement separated by a critical coupling strength. 
A. Ferreira, A. Guerreiro and V. Vedral