The Generation Of Quantum Correlations Between Two Qubits Driven By Classical Stochastic Fields

The quantum entanglement reflect the nonclassical correlations among multil-body system, which is an important resources of quantum information processing. Recent studies reveal that quantun entanglement does not include the realm of quantum correlations. Although the existence of genuinely quantum correlations can be usually inferred by the presence of entanglement among parts of a system, it can be shown that they can appear even when entanglement is absent and local environmental noises can produce quantum discord but quantum entanglement, these are exciting results quantum discord compared to the case of entanglemnt.In this paper, we study a system consisting of two identical, non-interacting two-level atoms, each locally interacting with a classical stochastic field, which can produce quantum correlations. We study from two aspects:Firstly, the two non-correlated qubits are placed in two external reservior, each connected to its own classical stochastic field,here the two stochastic fields have no correlations, we only consider the two atoms under the action of the vacuum radiation field. Secondly, in the oversight of the spontaneous radition, by turning on the correlation between the stochastic fields. The study indicate that both can make the generation of the quantum correlation between the qubits, but when the atoms are in place of the same initial zero quantum discord state, the quantum correlation between the two qubits are stronger which driven by the classical noise fields. And the stronger correlation between the classical stochastic fields, the bigger value of the quantun discord between the atoms. The quantum correration between the qubits can be preserved more longer.