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Acta Optica Sinica

Entanglement Properties in the System of Atom Interacting with Two-Mode Cavity

卢道明 Lu Daoming, 邱昌东 Qiu Changdong

Published Jan 1, 2013• 0 citations
Publisher
DOI
10.3788/aos201333.1227003

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We investigate the entanglement properties of a system of two dipole-dipole coupled two-level atoms resonantly interacting with a two-mode thermal field in a high- Q cavity. We obtain the evolution operator for this system in an analytical form, and use it to evaluate the atom-atom entanglement through the calculation of the negativity. The results show that the atom-atom entanglement is dependent on cavity field intensity and dipole interaction strength. We find that the dipole interaction can produce a considerable amount of entanglement between the two atoms.
The two-excitation system comprising two two-level atoms resonantly interacting with two coupled cavities is analyzed.The evolution of the state vector of the system is given when the total excitation number equals two.By means of the numerical calculations,the temporal evolution in the entanglement is investigated between the atoms,between the cavities,as well as between the atom and the local cavity mode.The influences of coupling constant between cavities on the entanglements are discussed.The results obtained show that atom and atom are separable,and the cavity-cavity entanglement and the atom-cavity entanglement are weakened with increasing of the coupling constant between cavities.
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.