Non-monotonic entanglement of physical EM field states in non-inertial   frames
  We develop a general technique to analyse the quantum effects of acceleration on realistic spatially-localised electromagnetic field states entangled in the polarization degree of freedom. We show that for this setting, quantum entanglement may build up as the acceleration increases, providing a clear signature of the quantum effects of relativistic acceleration. 
Miguel Montero, Marco del Rey, Eduardo Martin-Martinez
quant-ph gr-qc