In this paper, we consider quantum correlations (quantum discord and local quantum uncertainty) in a vertical quantum dot. Their dependencies on magnetic field and temperature are presented in detail. It is noticeable that, quantum discord and local quantum uncertainty behavior is similar to a large extent. In addition, the time evolution of quantum discord and local quantum uncertainty under dephasing and amplitude damping channels is investigated. It has been found that, for some Belldiagonal states quantum discord is invariant under some decoherence in a finite time interval [Phys. Rev. Lett. 104, 200401 (2010)]. Also, our results show that quantum discord is invariant under dephasing channel for a finite time interval in a vertical quantum dot, while this phenomenon does not occurs for local quantum uncertainty case.
Effect of the Förster Interaction and the Pulsed Pumping on the Quantum Correlations of a Two Quantum Dot-Microcavity System in the Strong Coupling Regime
A circular dielectric grating for vertical extraction of single quantum dot emission
我们展示了一个纳米结构组成的部分蚀刻环形沟槽在悬浮的GaAs膜，设计用于有效和适度的宽带（约1000毫米）。5nm）的发射提取。模拟表明，嵌入纳米结构中心的偶极子以接近高斯的远场向上辐射到自由空间中，允许收集效率> 80%，具有高数值孔径（NA=0.7）光学器件，并且具有12 X Purcell辐射率增强。制造的器械显示出约10%的光子收集效率，NA=0.42物镜，比未图案化GaAs中的量子点提高20倍。四倍激子寿命减少表明适度的Purcell增强。
Thermal Rectification in the Nonequilibrium Quantum-Dot-System
研究了具有Dzyaloshinskiii-Moriya相互作用（DM相互作用）的双量子点系统的量子热输运。通过改变能量劈裂或DM相互作用强度，可以控制热整流的符号。系统中的各向异性项也会影响整流的符号。与其他方案[Phys. Rev. B 80，172301（2009）]相比，该模型可以提供更大的整流效率，并在设计小尺寸（N=2）的极性可控热二极管中显示出潜在的应用前景。此外，还研究了双量子点的量子关联。我们发现在大的温度偏置区可以得到几乎完美的量子关联，并且量子纠缠比量子不和谐对DM相互作用强度的变化更敏感。
Deterministic nanofabrication for engineering nanowire quantum dot devices
University of Waterloo（滑铁卢大学）；Institute for Quantum Computing, University of Waterloo（滑铁卢大学量子计算研究所）；Quantum-Nano Fabrication and Characterization Facility, University of Waterloo（滑铁卢大学量子纳米加工与表征设施）；National Research Council Canada（加拿大国家研究委员会）；Queen’s University（女王大学）
