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arXiv quant-ph/0403135quant-phcond-mat.mes-hall
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量子临界点附近自旋链边界和边界临界点系统中的纠缠

Entanglement at the boundary of spin chains near a quantum critical point and in systems with boundary critical points

T. Stauber, F. Guinea

摘要:

我们分析了自旋(量子比特)在量子临界点附近附着在自旋链的边界上,或附着在边界临界点附近的耗散环境中,如Kondo类系统或耗散二能级系统的纠缠特性。在第一种情况下,我们表明,纠缠的性质是显着不同的散装自旋。在边界处,靠近过渡的影响不太明显。在第二种情况下,我们的结果表明,纠缠突然改变的相干量子振荡停止存在的点。相变对纠缠的影响很小。

英文摘要:

We analyze the entanglement properties of spins (qubits) attached to the boundary of spin chains near quantum critical points, or to dissipative environments, near a boundary critical point, such as Kondo-like systems or the dissipative two level system. In the first case, we show that the properties of the entanglement are significantly different from those for bulk spins. The influence of the proximity to a transition is less marked at the boundary. In the second case, our results indicate that the entanglement changes abruptly at the point where coherent quantum oscillations cease to exist. The phase transition modifies significantly less the entanglement.

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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