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 × 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.

在本文中，我们假设当电子之间的库仑相互作用比其隧穿更高时，量子点可以被同化为Fermi Hubbard位。对量子点的小尺寸阵列中的成对纠缠的研究允许将每对模型化为四方-四方系统（4×4混合态），而不是在量子信息中将其描述为量子位-量子位的更常见且更简单的方法系统。我们研究了库仑相互作用和温度对成对纠缠以及量子相干和总相关性的影响。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升高。此外，我们成功地根据能谱解释了这些相关性的行为，