Initial decoherence and disentanglement of open two-qubit systems

In this Letter we investigate an open two-qubit model whose dynamics is not exactly solvable. When the initial state is the maximum entangled state, as the exactly solvable open two-qubit model [D. Tolkunov, V. Privman, P.K. Aravind, Phys. Rev. A 71 (2005) 060308(R)], the decay of entanglement of formation of the model, expressed by concurrence is also governed by the product of suppression factors describing decoherence of the subsystems (qubits). However, if the initial state is not the maximum entangled state, its concurrence will decrease faster than the product of the suppression factors describing decoherence of the qubits.