论文标题
四级量子点系统中的成对量子相关性
Pairwise quantum correlations in four-level quantum dot systems
论文作者
论文摘要
在本文中，我们假设当电子之间的库仑相互作用与隧道相比，量子点可以被吸收到费米哈伯德位点。对小尺寸量子点阵列的成对纠缠的研究允许将每个对建模为四边形 - 季度系统（4 $ \ times $ 4混合状态），而不是将其描述为量子信息中的更为常见和简单的方法作为Qubit-Qubit系统。我们研究库仑相互作用和温度对成对纠缠以及量子相干性和总相关的影响。这项研究的关键结果是，当库仑相互作用更强时，纠缠可以更好地抵抗温度的升高。此外，我们成功地解释了这些相关性的行为，即基态退化和状态能量差。
In this paper we assume quantum dots can be assimilated to Fermi Hubbard sites when the Coulomb interaction between electrons is higher compared to their tunneling. The study of pairwise entanglement in a small size array of quantum dots allows to model each pair as a quadrit-quadrit system (4 $\times$ 4 mixed state) instead of the more common and simplistic approach of describing it in quantum information as a qubit-qubit system. We study the effect of Coulomb interaction and temperature on pairwise entanglement as well as on quantum coherence and total correlations. The crucial results of this study are that entanglement resists better the increase in temperature when the Coulomb interaction is stronger. Moreover, we successfully explain the behavior of these correlations in terms of the energy spectrum, namely the ground state degeneracy and the state energy difference.
