Quantum entanglement in a system of squeezed coherent state light field interacting with two entangled atoms

Abstract

Abstract:

The quantum entanglement in a system which is composed of two entangled atoms interacting with the squeezed coherent state is studied by means of the full quantum theory. The influences of the coherent amplitude factor, the squeezing factor, the ratio of two coupling coefficients on the entanglement property are discussed. The result shows that two atoms entanglement evolution property is opposed to atom-field entanglement evolution property when the coherent amplitude factor was zero or small. The interaction of the atoms and the field weaken the entanglement degree of atom-atom. With increasing coherent amplitude factor or decreasing squeezing factor of light, the time of two atoms stay in the steady entangled state become longer. The increase of the coherent amplitude factor or the decrease of squeezing factor of light will lead to the increase of atom-atom entanglement degree while the decrease of atoms-field entanglement degree. Moreover, the two-atom quantum state will stay in the maximum entangled state when the atomic dipole-dipole coupling coefficient is large enough.

Key words: quantum optics, quantum entanglement, relative entropy, field entropy, squeezed coherent state

ZHANG Cai-Hua, SA Chu-Er-Fu, GE Ri-Le. Quantum entanglement in a system of squeezed coherent state light field interacting with two entangled atoms[J]. J4, 2010, 27(1): 57-62.

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