Quantum Fisher Information in the Generalized One-axis Twisting Model

被引：27
|
作者：
Liu, Wan-Fang [1 ,2 ]
Xiong, Heng-Na [1 ]
Ma, Jian [1 ]
Wang, Xiaoguang [1 ]
机构：
[1] Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Zhejiang, Peoples R China
[2] Anqing Teachers Coll, Sch Phys & Elect Engn, Anqing 246011, Peoples R China
来源：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2010年 / 49卷 / 05期
关键词：
Quantum Fisher information; One-axis twisting model; Heisenberg limit; Entanglement; STATISTICAL DISTANCE; STATE;
D O I：
10.1007/s10773-010-0286-5
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：1073 / 1081
页数：9
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