AI 中文总结
研究双量子点分子中两个偶极 - 偶极耦合电子的无基矢量子相干性和量子资源热动力学，用多种方法量化量子关联，发现偶极 - 偶极耦合等参数对量子特性有不同影响，联合作用可接近纠缠最大值并扩展相关温度范围。
AI 中文摘要
本工作研究了空间分离的量子点（QD）分子中两个偶极 - 偶极耦合电子的无基矢量子相干性和基于关联的量子资源的热动力学。利用局域和集体相干性来表征单量子点量子叠加和子系统间相干性。采用布雷斯距离纠缠、局部量子不确定性（LQU）和局部量子费希尔信息（LQFI）来量化两个双量子点之间的量子关联。研究结果表明，偶极 - 偶极耦合\(K\)是最有效的保护参数，能延长纠缠猝死温度，减少局部量子叠加并增强集体相干性。偶极 - 偶极相互作用对在纠缠猝死温度之后保护LQU和LQFI也有关键影响。库仑排斥\(J\)通过独立通道加强这种保护，将热态投影到纠缠的\(\{|0_A 1_B\rangle,|1_A 0_B\rangle\}\)子空间；它们的联合作用是接近纠缠最大值所必需的，并且增强集体相干性并扩展LQU和LQFI保持可观的温度范围。能量失谐\(\varepsilon\)可增强局域相干性，但反常地加速纠缠猝死并通过削弱两体关联来淬灭LQU和LQFI。点间隧穿\(\Gamma\)在低温下增强局部叠加，但降低集体相干性，降低纠缠猝死温度并破坏其他非经典关联。
英文摘要
This work examines the thermal dynamics of basis-independent quantum coherence and correlation-based quantum resources for two dipole-dipole-coupled electrons confined in spatially separated quantum-dot (QD) molecules. Single-dot quantum superpositions and inter-subsystem coherence are characterized by using localized and collective coherence. Quantum correlations between the two double quantum dots are quantified by employing Bures distance entanglement, Local quantum uncertainty (LQU), and local quantum Fisher Information (LQFI). The findings show that dipole-dipole coupling $K$ is the most effective protective parameter, extending the entanglement sudden death temperature, diminishing the local quantum superpositions and enhancing the collective coherence. The dipole-dipole interaction has also a crucial impact on protecting LQU and LQFI beyond the entanglement sudden death temperature. Coulomb repulsion $J$ reinforces this protection through an independent channel, projecting the thermal state onto the entangled $\{|0_A 1_B\rangle,|1_A 0_B\rangle\}$ subspace; their combined action is required to approach the entanglement maximum, and it enhances collective coherence and extends the temperature range over which LQU and LQFI remain appreciable. Energy detuning $\varepsilon$ can enhance localized coherence but paradoxically accelerates the entanglement sudden death and quenches LQU and LQFI by weakening two-body correlations. Inter-dot tunneling $Γ$ enhances local superpositions at low temperature, but it reduces collective coherence, lowers the entanglement sudden death temperature, and disrupts other nonclassical correlations.
