Qubit disentanglement in local squeezed reservoirs

We consider the influence of the local squeezed vacuum fields on two initially entangled two-qubit system. By considering the upper bound of entanglement under time evolution, we find that the decay of the quantum entanglement shows different behavior for different time scales (t≫max{(2βA)−1,(2βB)−1}t≫max{(2βA)−1,(2βB)−1} and t≪min{(2βA)−1,(2βB)−1}t≪min{(2βA)−1,(2βB)−1}). The relative phase of the squeezing environment can also affect the entanglement dynamics profoundly.