مشخصات پژوهش

We describe the dynamics of entanglement of three-mode Gaussian states of a system composed of three bosonic modes, each one immersed in its own thermal reservoir, in the framework of the theory of open systems based on completely positive quantum dynamical semigroups. By using the criteria for the separability of three-mode systems, we classify the states by different values of the parameters characterizing the system and the thermal reservoirs. We consider a fully inseparable state as an initial state and show that for definite values of temperature and dissipation constants, the class of entanglement to which the state of the system belongs is changing during its time evolution. For all non-zero values of temperatures of the thermal baths, suppression of entanglement of the initial state always takes place, and in the limit of large times the state is fully separable, corresponding to an asymptotic product state.