Entanglement of two atoms through different couplings and thermal noise

摘要

The entanglement of two atoms is studied when the two atoms are coupled to a single-mode thermal field with different couplings. The different couplings of the two atoms is favourable to entanglement: they not only make the case that two atoms with different couplings can be entangled (whereas atoms with the same couplings are not entangled), but also enhance the entanglement when the relative difference of the two couplings is in a certain range. We also show that the relative difference of the couplings can improve the critical temperature. If the optical cavity is leaky during the time evolution, for the initial atomic state lee), the dissipative thermal environment benefits the production of entanglement when the cavity is initially in a vacuum state.