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We study the exact entanglement dynamics of two qubits in a common structuredreservoir. We demonstrate that, for certain classes of entangled states,entanglement sudden death occurs, while for certain initially factorizedstates, entanglement sudden birth takes place. The backaction of thenon-Markovian reservoir is responsible for revivals of entanglement aftersudden death has occurred, and also for periods of disentanglement followingentanglement sudden birth.

Sudden death and sudden birth of entanglement in common structured reservoirs