Entanglement generation and enhancement in three-qubit systems by local perturbation

Abstract

In this paper, we investigate the entanglement dynamics in a spin chain of three qubits wherein the second qubit is the only connection between the first and the third and interacts with a perturbing field. Measured in terms of concurrence, the entanglement between the first and the third qubits is generated by perturbing the second qubit locally. Furthermore, by increasing the intensity of the perturbing field, the behavior of the concurrence through time is enhanced.