Momentum correlations of scattered particles in quantum field theory:   one-loop entanglement generation
  We compute the entanglement entropy variation between initial (separable or entangled in the momenta) and final states $\Delta S_E$ in an elastic scattering of a bipartite system composed by two interacting scalar particles. We perform a quantum field theoretical calculation to one loop order and verify that $\Delta S_E $ changes as we vary the energy of incoming particles and the coupling strength in a non-trivial way. 
Ricardo Faleiro, Rafael Pav\~ao, Helder Alexander, Brigitte Hiller,   Alex Blin, Marcos Sampaio
hep-ph quant-ph