Entanglement dynamics of two qubits induced by a reservoir of coupled bosons

Entanglement dynamics of two qubits coupling to the degenerate coupled bosons reservoir (DCBR) have been analyzed. In the case of weak coupling, the envelope of the concurrence function shows exponential decay, and the stable concurrence shows oscillating change with coupling strength between modes. In the case of strong coupling, the concurrence function instead shows non-exponential decay in the initial short time.