| Entanglement is a central property of quantum mechanics. It's not only a basic issue of quantum mechanics.but also means significance in quantum information and computation.In this paper we study the tripartite continuous-variable entanglement in triply concurrent parametric oscillation. Considering the cavity's decay ,the system, whose entanglement is enhanced continuously till to the steady state as the time evolves ,is in the completely symmetric state .while the intensity of interaction of three nondegenerate coupling are identical .Moreover, when there exist only two nondegenerate coupling coefficients.the system has the steady entanglement state and the degree of the entanglement depends on the coupling coefficients.In addition.the system presents the entanglment but unsteady state without taking decay into account. |
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