Entropy Exchange in Coupled Field-Superconducting Charge Qubit System with Intrinsic Decoherence

Based on the intrinsic decoherence effect, partial entropy properties of a superconducting charge qubit inside a single-mode cavity field is investigated, and entropy exchange which is recently regarded as a kind of anti-correlated behavior of the entropy between subsystems is explored. Our results show that although the intrinsic decoherence leads to an effective irreversible evolution of the interacting system due to a suppression of coherent quantum features through the decay of off-diagonal matrix elements of the density operator and has an apparently influence on the partial entropy of two individual subsystems, it does not effect the entropy exchange between the two subsystems.