| 耗散腔中两二能级原子态的自旋压缩,量子Fisher信息和最大自旋涨落 |
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| 引用本文： | 刘万芳. 耗散腔中两二能级原子态的自旋压缩,量子Fisher信息和最大自旋涨落[J]. 原子与分子物理学报, 2011, 28(5) |
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| 作者姓名： | 刘万芳 |
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| 作者单位： | 安庆师范学院 |
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| 基金项目： | 国家教育部“高等学校高层次创造性人才计划”“2008高等学校青年骨干教师国内访问学者项目”,安徽省教育厅高校省 |
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| 摘 要： | 在能量耗散腔中,原子用泡利算符描述,光场用相干态描述,运用密度矩阵理论,得到了两二能级原子密度矩阵元的演化规律,分析了与单模辐射场作用过程中原子态的自旋压缩、量子Fisher信息和最大自旋涨落.结果表明:自旋压缩,大于 的最大自旋涨落可以作为量子纠缠的充分必要判据.自旋压缩, 大于 的最大自旋涨落和量子纠缠,它们互相等价.大于1的Fisher信息与它们之间没有等价关系,但可以作为自旋压缩和量子纠缠的充分判据.
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| 关 键 词： | 二能级原子 单模辐射场 量子Fisher信息 自旋压缩 最大自旋涨落 |
Spin squeezing, quantum Fisher information and maximal spin fluctuation of a pair atom with two-level in the dissipative cavity |
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| liuwanfang. Spin squeezing, quantum Fisher information and maximal spin fluctuation of a pair atom with two-level in the dissipative cavity[J]. Journal of Atomic and Molecular Physics, 2011, 28(5) |
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| Authors: | liuwanfang |
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| Abstract: | we investigate the fidelity of several kinds of coherence states in the coordinate representation, and the analytic expression was given for coherence state, the relation between the fidelity and the character length and translation distance was discussed, and the influences of quantum interference of the initial state on the fidelity are discussed for superposition state of and .The results show that the fidelity evolved periodic; compared to fidelity of the coherence state, quantum interference can decrease the distortion of state when harmonic oscillator is in the second kind of coherence states, and quantum interference can decrease the distortion or increase the distortion when harmonic oscillator is in the third kind of coherence states. |
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| Keywords: | two-level atom single mode radiation field the quantum Fisher information the spin squeezing the maximal fluctuation of spin |
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