Complete four-photon cluster-state analyzer based on cross-Kerr nonlinearity |
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| Authors: | Wang Zhi-Hui Zhu Long Su Shi-Lei Guo Qi Cheng Liu-Yong Zhu Ai-Dong and Zhang Shou |
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| Institution: | [1]Department of Physics, College of Science, Yanbian University, Yanji 133002, China [2]Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China |
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| 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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| Keywords: | cluster-state analyzer quantum information parity gate cross-Kerr nonlinearity |
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