| Quantum Fisher information and spin squeezing in one-axis twisting model |
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| 作者姓名： | 钟伟 刘京 马健 王晓光 |
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| 基金项目： | supported by the National Basic Research Program of China(Grant No.2012CB921602);the National Natural Science Foundation of China(Grant Nos.11025527 and 10935010) |
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| 摘 要： | We investigate the dependence of the average parameter estimation precision （APEP）, which is defined by the quantum Fisher information, on the polar angle of the initial coherent spin state ｜θ0,φ0〉 in a one-axis twisting model. Jin et al. New J. Phys. 11 （2009） 073049] found that the spin squeezing sensitively depends on the polar angle θ0 of the initial coherent spin state. We show explicitly that the APEP is robust to the initial polar angle θ0 in the vicinity of π/2 and a near- Heisenberg limit 2IN in quantum single-parameter estimation may still be achieved for states created with the nonlinear evolution of the nonideal coherent spin states θ0- π/2. Based on this model, we also consider the effects of the collective dephasing on spin squeezing and the APEE
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| 关 键 词： | Fisher信息 自旋状态 量子 扭转 压缩 模型 轴 非线性演化 |
Quantum Fisher information and spin squeezing in one-axis twisting model |
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| Zhong Wei,Liu Jing,Ma Jian,Wang Xiao-Guang.Quantum Fisher information and spin squeezing in one-axis twisting model[J].Chinese Physics B,2014(6):23-29. |
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| Authors: | Zhong Wei Liu Jing Ma Jian Wang Xiao-Guang |
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| Abstract: | quantum Fisher information, spin squeezing, one-axis twisting model |
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| Keywords: | quantum Fisher information spin squeezing one-axis twisting model |
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