Entanglement Dynamics of Two V-type Atoms with Dipole-Dipole Interaction in Dissipative Cavity

TL;DR

This paper analyzes how dipole-dipole interactions, cavity-environment coupling, and spontaneously generated interference influence entanglement dynamics in a system of two V-type atoms within a dissipative cavity, providing analytical solutions and detailed insights.

Contribution

It offers an analytical solution for the entanglement dynamics of two V-type atoms with dipole-dipole interaction in a dissipative cavity, highlighting the effects of SGI and cavity coupling.

Findings

SGI parameter affects entanglement decay differently based on initial states.

Stronger dipole-dipole interaction slows entanglement decay and enhances entanglement generation.

Entanglement oscillates under strong cavity-environment coupling.

Abstract

In this work, we study a coupled system of two V-type atoms with dipole-dipole interaction in a dissipative single-mode cavity, which couples with an external environment. We obtain the analytical solution of this model by solving the time dependent Schrodinger equation after we diagonalize Hamiltonian of dissipative cavity by introducing a set of new creation and annihilation operators according to Fano theorem. We also detailedly discuss the influences of cavity-environment coupling, spontaneously generated interference (SGI) parameter and dipole-dipole interaction between two atoms on entanglement dynamics under different initial states. The results show that the SGI parameter has different effects on entanglement dynamics under different initial states. Namely, the SGI parameter will increase the decay rate of the initially maximal entangled state and reduce that of the initially partial entangled state. For the initially product state, the larger SGI parameter corresponds to the more entanglement generated. The entanglement monotonically decreases under the weak cavity-environment coupling, while the oscillation of entanglement will occur under the strong cavity-environment coupling. The larger the dipole-dipole interaction is, the slower the entanglement decays and the more the entanglement will be generated. So the dipole-dipole interaction can not only protect and generate entanglement very effectively, but also enhance the regulation effect of the SGI parameter on entanglement.