Entanglement witnesses of four-qubit tripartite separable quantum states |
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Authors: | Miao Xu |
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Institution: | 1.College of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;2.School of Information & Electrical Engineering, Zhejiang University City College, Hangzhou 310015, China |
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Abstract: | A quantum entangled state is easily disturbed by noise and degenerates into a separable state. Compared to the entanglement with bipartite quantum systems, less progress has been made for the entanglement with multipartite quantum systems. For tripartite separability of a four-qubit system, we propose two entanglement witnesses, each of which corresponds to a necessary condition of tripartite separability. For the four-qubit GHZ state mixed with a W state and white noise, we prove that the necessary conditions of tripartite separability are also sufficient at W states side. |
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Keywords: | tripartite separability entanglement witness GHZ state W state |
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