Controlling entanglement dynamics via Raman interaction in two-mode cavity QED

Abstract

We investigate the entanglement dynamics of an entangled atom pair via Wootters' concurrence. Only one atom of the pair interacts with a two-mode cavity field via a Raman interaction. The number simulation shows that the entanglement of the atom pair will display sudden death and revival phenomena when the cavity photon numbers and the two-mode atom–cavity coupling strengths are changed. Due to the two-mode field effect, the entanglement sudden death phenomenon will disappear more easily by enlarging the different cavity mode–atom coupling ratio. The oscillation rate of the concurrence is enlarged by increasing the mean photon number of the cavity field.

Whispering galleries and the control of artificial atoms

“…Using the principles behind concurrence Yu and Eberly 12 discovered that entanglement may be born out of a bipartite system only to endure a series of deaths interspersed by revivals. This phenomenon was named entanglement sudden death ( ESD ) 13 . We find that this occurs for certain parameters in a system of two coupled flux qubits that are controlled by a plasmonic waveguide.…”