Generation of a continuous-variable quadripartite cluster state multiplexed in the spatial domain

作     者：CHUNXIAO CAI LONG MA JUAN LI HUI GUO KUI LIU HENGXIN SUN RONGGUO YANG JIANGRUI GAO 

作者机构：State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Collaborative Innovation Center of Extreme Optics Shanxi University 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2018年第6卷第5期

页      面：479-484页

核心收录：

学科分类：0808[工学-电气工程] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(NSFC)(91536222,11674205) Ministry of Science and Technology of the People’s Republic of China(MOST)(2016YFA0301404) Program for the Outstanding Innovative Team of Higher Learning Institution of Shanxi Shanxi "1331 Project" 

主　　题：Generation of a continuous-variable quadripartite cluster state multiplexed in the spatial domain 

摘      要：As a highly entangled quantum network, the duster state has the potential for greater information capacity and use in measurement-based quantum computation. Here, we report generating a continuous-variable quadripartite ＂square＂ cluster state of multiplexing orthogonal spatial modes in a single optical parametric amplifier （OPA）, and further improve the quality of entanglement by optimizing the pump profile. We produce multimode en- tanglement of two first-order Hermite-Gauss modes within one beam in a single multimode OPA and transform it into a duster state by phase correction. Furthermore, the pump-profile dependence of the entanglement of this state is explored. Compared with fundamental mode pumping, an enhancement of approximately 33% is achieved using the suitable pump-profile mode. Our approach is potentially scalable to multimode entanglement in the spatial domain. Such spatial duster states may contribute to future schemes in spatial quantum information processing.