Generation, manipulation, and detection of two-qubit entanglement in   waveguide QED
  We study the possibility of using guided photons to generate, control, and measure the entanglement of two qubits that is mediated by a one-dimensional waveguide. We show how entanglement can be generated both with single photon and with two-photon wavepackets. The introduction of a second photon allows for a manipulation of the entanglement between the qubits, and phenomena such as sudden death and revival of entanglement appear. Finally, we propose a procedure for entanglement detection via the scattering output of a single-photon over a qubit state. 
C. Gonzalez-Ballestero, Esteban Moreno, F.J. Garcia-Vidal
quant-ph cond-mat.other physics.optics