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Physica A Statistical Mechanics and its Applications

Phase properties of a coherent field interacting with two two-level atoms in a cavity

Ho Trung Dung, Nguyen Dinh Huyen, A.S. Shumovsky

Published Mar 1, 1992• 14 citations
Publisher
DOI
10.1016/0378-4371(92)90355-t

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The properties of state evolution of the atom,field,and atom-field system in the system of two two-level atoms inside a phase-damping cavity interaction with a coherent field under the condition of large detuning are investigated by using the distance between density operators.The effects of the mean photon number of the filed and the phase damping on the dynamical behaviour in the system are discussed.The results show that the cavity phase damping can change the characters of the distance between density operators of the field and the atom-field system significantly,but the state evolution of the atom is independent of the cavity phase damping.
Considering a system comprised of two-level atoms resonantly interacting with weak coherent states trapped in two distant cavities connected by an optical fiber initially, we study the entanglement properties of the atom-atom, the cavity-cavity and the atom-cavity. Then the influences of the ratio between fiber-cavity and atom-cavity coupling intensity, the intensity and the phase of the cavity field on the entanglement properties are investigated numerically. It is shown that the entanglements of the atom-atom, the cavity-cavity and the atom-cavity vary with time in the periodical or approximately periodical manner; the entanglement can be transferred from cavity-cavity to atom-atom reciprocally. Compared with the entanglements of atom-atom and cavity-cavity, the varying period of atom-cavity entanglement is short. The ratio of fiber-cavity coupling intensity to atom-cavity coupling intensity and the phase of cavity field affect the entanglement properties greatly. The great entanglement can be achieved by using a smaller ratio of coupling intensity between fiber-cavity and atom-cavity.