Quantum Fisher Information in the Generalized One-axis Twisting Model |
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| Authors: | Wan-Fang Liu Heng-Na Xiong Jian Ma Xiaoguang Wang |
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| Affiliation: | 1.School of Physics and Electric Engineering,Anqing Teachers College,Anqing,China;2.Zhejiang Institute of Modern Physics, Department of Physics,Zhejiang University,Hangzhou,China |
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| Abstract: | We investigate the quantum Fisher information (QFI) of symmetric states for spin-s particles. We derive the maximal QFI, and find that quantum spin correlations are essential ingredients of the maximal QFI. We make applications to the generalized one-axis twisting model. The results show that the redistributions of uncertainties on the basis of the quantum correlations in the multiqubit system are useful for sub-shot-noise phase sensitivity. Furthermore, for high-spin (s>1/2) composite systems, we find a sufficient criterion for entanglement. |
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