Entanglement generation in double-$Λ$ system
In this paper, we study the generation of entanglement in a double-$Λ$ system. Employing standard method of laser theory, we deduce the dynamic evolution equation of the two-mode field. We analyze the available entanglement criterion for double-$Λ$ system and the condition of entanglement existence. Our results show that under proper parameters, the two-mode field can entangled and amlified.
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