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Journal of Jiangxi Normal University

Influence of the Dipole-Dipole Interaction between Atoms on the Entanglement of Tavis-Cummings Model with Two Photon Process

Xie Fang-sen

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

The evolution of the entanglement in the T-C model was studied in condition of the dipole-dipole interaction between two atoms.The system will evolve into three-body w-entangled state,when the initial state of system is|2,g1,g2〉 or γ|0,g1,e2〉+1-γ2|0,e1,g2〉.The evolution of entanglement changes when the initial state ofthe system are different.

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The evolution of the entanglement in the T-C model was studied in condition of the dipole-dipole interaction between two atoms.The system will evolve into three-body w-entangled state,when the initial state of system is|2,g1,g2〉 or γ|0,g1,e2〉+1-γ2|0,e1,g2〉.The evolution of entanglement changes when the initial state ofthe system are different.
The entanglement dynamics involving the so-called entanglement sudden death of atoms in two-photon Tavis-Cummings model is investigated.Various initial conditions that may have influences on the entanglement evolution of atoms, especially on the appearance of atomic entanglement sudden death, are studied.The appearance of entanglement sudden death is sensitive to the initial conditions of the whole system, i.e., the concrete type of atomic initial state, the photon number in the cavity field, and the dipole-dipole interaction between atoms.It is shown that the strong dipole-dipole interaction between atoms can weaken the atomic entanglement sudden death.
The quantum entanglement of the Tavis-Cummings model for two identical two-level atoms interacting with a single-mode field is considered.When the field is one photon and the two atoms stay in ground states initially,it is abtained that the system will evolve to a three-body approximate state.The result shows that every entanglement measure of the system will be reduced when atomic coupling coefficient is larger than coupling coefficient between field and atom,and the entanglement measure of atoms and the entanglement measure between two atoms with field will be reduced more quickly.Meanwhile,every entanglement measure periodic will be also shortened relevantly.