New features of total correlations in coupled Josephson charge qubits with intrinsic decoherence

Adopting the framework of two-coupled superconducting charges model, we derive a general formula for the total correlation function between the two charge qubits initially prepared in a mixed state. The impact of the different parameters of the system is explicitly investigated. We have identified a class of two-qubit states that have rich dynamics when the deviation between the characteristic energies of the charge qubits tends to a minimum value. Present calculations show that the total correlation decreases abruptly to zero in a finite time due to the influence of the decoherence.