Dynamics of skew information correlations in two coupled qubit-systems under the high nonlinearity of a parametric amplifier: Intrinsic decoherence model

Abstract

In this paper, we study the dynamics of skew information correlations, beyond its concurrence entanglement, between two coupled qubits interacting with containing amplifier cavity fields. An analytical description has been obtained for the intrinsic decoherence model when the cavity fields are initially in a superposition of generalized Barut–Girardello coherent states. The concurrence and skew information quantifiers present nonlocal correlations with different oscillatory behaviors, which can be controlled by the two-qubit coupling and the initial cavity nonclassicality. The sudden death–birth phenomenon is observed only in the concurrence entanglement behavior. With the intrinsic decoherence, the stationary correlated two-qubit states can be generated, which have different potential applications in quantum information. It is found that the two-qubit coupling affects the generated nonlocal correlations (NLC) as additional decoherence, reduces the generated nonlocal correlations, and accelerates the stable correlations. The initial even-coherent nonclassicality enhances the nonlocal correlations, which are more robust against the intrinsic decoherence.