Entanglement dynamics of two-qubit system in different Pauli channels

The entanglement dynamics of the two-qubit system is investigated which is the mixed state between the maximally entangled state and the additional state when they transmitted through different Pauli channels and depolarizing channel. With the help of the concurrence, except for Pauli σ_z channel, the two-qubit system will be show the entanglement sudden death(ESD) character. Meanwhile, by comparing concurrence when our quantum system returns to the maximally entangled Bell state, our model gives a concrete example to support the conclusion in the previous reference.