Entanglement preservation of two coupled modes

Yu-Chen Hou, Guo-Feng Zhang, Yan Chen +1 more

Wang Ju-xia, Yang Zhi-yong, Yuying An +1 more

Using the complete quantum theory，the process of M two-level atoms interacting with M multi-mode light fields with intensity-dependent coupling is studied. It is found that quantum entanglement information can be transferred back and forth or be preserved between the cavity fields and atoms under certain time conditions. The entanglement states of the atoms or the cavities can be transferred when t=π/(2λ). The results are verified by numerically computing the entanglement degree. And it was shown that the entanglement states of the atoms or the cavities can be preserved when t=π/λ.

Andrzej Veitia, Jun Jing, Ting Yu +1 more

M. A. Fasihi

Abstract We address the problem of atom–atom entanglement dynamics control in a system of two different two-level atoms with dipole–dipole interaction coupled to a common single mode cavity with different coupling strengths. The control of entanglement dynamics is based on the parity kick method, and we use the antisymmetry properties of the Hamiltonian of the system to maintain atom–atom entanglement. We classify the possible controllable cases of this system. The control procedure is carried out with a sequence of cyclic evolution; accordingly, the entanglement of the system is protected for any given initial state with any desired precision and long duration.

Antonio S. M. de Castro, V. V. Dodonov

Yuying An

The interacting process of two coupling atoms with single-mode light field by using of complete quantum theory.It is found that quantum entanglement information is transmitted,is exchanged between cavity fields and atoms,and is preserved in the cavity fields or atoms.The coupling action between atoms mainly effected the swapping process of quantum information.