Generation of continuous-variable quadripartite square cluster state and its entanglement improvement via quantum feedback
首发时间:2011-12-09
Abstract:In this paper, we investigate the generation of continuous-variable quadripartite square cluster state of optical fields and discuss the enhancement of the multipartite entanglement of the cluster state via quantum feedback. We show that the quadripartite square cluster state can be generated via concurrent OPO processes and the loss of the cavity will degrade the quantum correlations of the cluster state. By introducing appropriate feedback loops, we find that the entanglement and the purity of the cluster state can be improved significantly.
keywords: quantum optics continuous variable cluster state feedback
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