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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Liu, WF., Xiong, HN., Ma, J. et al. Quantum Fisher Information in the Generalized One-axis Twisting Model. Int J Theor Phys 49, 1073–1081 (2010). https://doi.org/10.1007/s10773-010-0286-5
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DOI: https://doi.org/10.1007/s10773-010-0286-5