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arXiv 0910.4567quant-ph
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利用非厄米算符探测纠缠

Detecting entanglement with non-hermitian operators

Mark Hillery, Ho Trung Dung, Julien Niset

摘要:

我们推导出几个纠缠条件,采用非厄米算子。我们从两个条件,推导出先前的场模算符,并使用它们来推导条件,可以用来显示存在的场原子纠缠和原子群之间的纠缠。原始条件可以通过使它们在某些局部酉变换集(例如高斯运算)下不变来加强。然后,我们将这些条件应用于几个例子,如迪克模型。最后,我们简要讨论了如何与非厄米算子的局部不确定性关系可以用来推导纠缠条件。

英文摘要:

We derive several entanglement conditions employing non-hermitian operators. We start with two conditions that were derived previously for field mode operators, and use them to derive conditions that can be used to show the existence of field-atom entanglement and entanglement between groups of atoms. The original conditions can be strengthened by making them invariant under certain sets of local unitary transformations, such as Gaussian operations. We then apply these conditions to several examples, such as the Dicke model. We conclude with a short discussion of how local uncertainty relations with non-hermitian operators can be used to derive entanglement conditions.

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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