Atomic Entanglement Properties Based on the Higher-Order Interaction
Atomic entangled states are crucial quantum resources in the study of quantum information and quantum computing.At present,the generation of such quantum states depends mainly on the second-order nonlinear interaction dynamic.In this paper,quantum states generated by the fourth-order nonlinear interaction are studied,and entanglement properties are investigated by contrast with quantum states produced by the second-order nonlinear interaction.Here we quantify their entanglement properties using quantum Fisher information and squeezing parameter respectively.Ideally,the fourth-order nonlinear interaction can generates highly entangled quantum states more quickly than the second-order nonlinear interaction,which is found to reach the Heisenberg limit.We also discover that in the initial moments of evolution,the four-order interaction can produce squeezed states more quickly,but the optimal squeezing of the second-order interaction is better.In addition,taking into account the noise effect on the entangled states produced by the second-order nonlinear interaction,we note that entangled states with the higher-order nonlinear interaction in weak interaction regions are more robust against decoherence.
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