Quantum Fisher Information of a 3-Qubit State |
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| Authors: | Xiao-jie Yi Guo-qiang Huang Jian-Min Wang |
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| Affiliation: | 1. College of Communication and Electron, Jiangxi Science and Technology Normal University, Nanchang, 330013, P.R. China
2. Jiangxi University of Finance and Economics, Nanchang, 330013, P.R. China
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| Abstract: | We investigate the properties of quantum Fisher information in a general superposition of a 3-qubit GHZ state and two W states. Numerical calculation for quantum Fisher information of the 3-qubit state is given. It is shown that the mean spin direction, the length of mean spin and quantum Fisher information are determined by the coefficients of superposition and the relative phase between the GHZ state and the W states. |
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