Complete four-photon cluster-state analyzer based on cross-Kerr nonlinearity
Wang Zhi-Hui (王志会)a, Zhu Long (朱龙)a, Su Shi-Lei (苏石磊)a, Guo Qi (郭奇)b, Cheng Liu-Yong (程留永)b, Zhu Ai-Dong (朱爱东)a, Zhang Shou (张寿)a
a Department of Physics, College of Science, Yanbian University, Yanji 133002, China; b Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China
Abstract 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.
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