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Generation of continuous-variable quadripartite square cluster state and its entanglement improvement via quantum feedback
Shi Gangde 1,Tan Huatang 2,Li Gaoxiang 2 * #
1.Department of physics, Huazhong Normal University, WuHan 430079
2.Department of physics, Huazhong Normal University, Wuhan 430079
*Correspondence author
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Funding: Project supported by National Natural Science Foundation of China （No.Grant No. 11074087 ）, the Ministry of Education under project SRFDP（No.Grant Nos. 200805110002, 200805111014）
Opened online: 9 December 2011
Accepted by: none
Citation: Shi Gangde,Tan Huatang,Li Gaoxiang.Generation of continuous-variable quadripartite square cluster state and its entanglement improvement via quantum feedback[OL]. [ 9 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4453619
 
 
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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