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arXiv quant-ph/0609044quant-ph
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集体相互作用谐振链的纠缠

Entanglement of Collectively Interacting Harmonic Chains

R. G. Unanyan, M. Fleischhauer, D. Bruss

摘要:

我们研究的基态纠缠的一维谐波链,相互耦合的集体相互作用实现,例如,在一个各向异性的离子晶体。由于集体类型的耦合,其中每个链以相同的方式与每个其他链相互作用,整个系统在与链正交的方向上显示出临界行为,而孤立的谐波链可以是有间隙的和非临界的。我们推导出较低的和最重要的上界的纠缠,量化的冯诺伊曼熵,一个紧凑的块之间的振荡器和它的环境。对于足够大的尺寸的子系统的界限相吻合,并表明,纠缠的面积定律是违反了对数修正。

英文摘要:

We study the ground-state entanglement of one-dimensional harmonic chains that are coupled to each other by a collective interaction as realized e.g. in an anisotropic ion crystal. Due to the collective type of coupling, where each chain interacts with every other one in the same way,the total system shows critical behavior in the direction orthogonal to the chains while the isolated harmonic chains can be gapped and non-critical. We derive lower and most importantly upper bounds for the entanglement,quantified by the von Neumann entropy, between a compact block of oscillators and its environment. For sufficiently large size of the subsystems the bounds coincide and show that the area law for entanglement is violated by a logarithmic correction.

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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