Complete four-photon cluster-state analyzer based on cross-Kerr nonlinearity  

作　　者：王志会 朱龙 苏石磊 郭奇 程留永 朱爱东 张寿 

机构地区：[1]Department of Physics,College of Science,Yanbian University [2]Center for the Condensed-Matter Science and Technology,Department of Physics,Harbin Institute of Technology

出　　处：《Chinese Physics B》2013年第9期263-266,共4页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 60667001 and 11165015)

摘　　要：We propose a method to construct an optical cluster-state analyzer based on cross-Kerr nonlinearity combined with linear optics elements. In the scheme, we employ two four-qubit parity gates and the controlled phase gate （CPG） from only the cross-Kerr nonlinearity and show that all the orthogonal four-qubit cluster states can be completely identified. The scheme is significant for the large-scale quantum communication and quantum information processing networks. In addition, the scheme is feasible and deterministic under current experimental conditions.We propose a method to construct an optical cluster-state analyzer based on cross-Kerr nonlinearity combined with linear optics elements. In the scheme, we employ two four-qubit parity gates and the controlled phase gate （CPG） from only the cross-Kerr nonlinearity and show that all the orthogonal four-qubit cluster states can be completely identified. The scheme is significant for the large-scale quantum communication and quantum information processing networks. In addition, the scheme is feasible and deterministic under current experimental conditions.

关 键 词：cluster-state analyzer quantum information parity gate cross-Kerr nonlinearity 

分 类 号：O431.2[机械工程—光学工程]