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arXiv quant-ph/0303100quant-ph
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双原子Dicke模型中的纠缠和自旋压缩

Entanglement and spin squeezing in the two-atom Dicke model

A. Messikh, Z. Ficek, M. R. B. Wahiddin

摘要:

分析了双原子Dicke模型中纠缠与自旋压缩参数之间的关系,并指出了Banerjee和Zhou等人最近提出的在没有自旋压缩的情况下也能观察到纠缠的矛盾的根源.我们的计算表明,有两个标准的纠缠,一个与双光子相干性,创造双光子纠缠态,和其他相关的集体态的人口。我们发现,自旋压缩参数只有在与双光子纠缠态相关联时才能正确地预测双原子Dicke系统中的纠缠,而在与纠缠对称态相关联时则不能预测纠缠.这明确地确定了差异的来源,并解释了为什么系统可以在没有自旋压缩的情况下纠缠。我们说明这些发现在三个例子中的相互作用的系统与热,经典压缩真空和量子压缩真空领域。

英文摘要:

We analyze the relation between the entanglement and spin-squeezing parameter in the two-atom Dicke model and identify the source of the discrepancy recently reported by Banerjee and Zhou et al that one can observe entanglement without spin squeezing. Our calculations demonstrate that there are two criteria for entanglement, one associated with the two-photon coherences that create two-photon entangled states, and the other associated with populations of the collective states. We find that the spin-squeezing parameter correctly predicts entanglement in the two-atom Dicke system only if it is associated with two-photon entangled states, but fails to predict entanglement when it is associated with the entangled symmetric state. This explicitly identifies the source of the discrepancy and explains why the system can be entangled without spin-squeezing. We illustrate these findings in three examples of the interaction of the system with thermal, classical squeezed vacuum and quantum squeezed vacuum fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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