Echeverri-Arteaga Santiago, Vinck-Posada Herbert, Gómez Edgar A
Departamento de Física, Universidad Nacional de Colombia, 111321, Bogotá, Colombia.
Programa de Física, Universidad del Quindío, 630004, Armenia, Colombia.
Heliyon. 2023 Jul 24;9(8):e18451. doi: 10.1016/j.heliyon.2023.e18451. eCollection 2023 Aug.
This work investigates the impact of decoherence induced by pure dephasing and phonon-assisted tunneling mechanisms on the optical and quantum properties of two quantum dots. Special attention is given to the density matrix at steady state, and a detailed analysis of populations, coherences, optical transitions and the emission spectrum is performed. Additionally, we study the influence of both phonon-decoherence mechanisms on bipartite entanglement and the degree of mixedness of the system. In particular, our findings indicate that the phonon-assisted tunneling mechanism partially affects the coherences of the system and quantum properties when the imbalance of phonon absorption and emission is significant. Conversely, the pure dephasing mechanism does not affect the populations but strongly entangles the quantum dots and the reservoir, inducing maximally mixed states and significantly reducing the spectral splitting in the emission spectrum of the system.
这项工作研究了由纯退相和声子辅助隧穿机制引起的退相干对两个量子点的光学和量子特性的影响。特别关注稳态下的密度矩阵，并对布居数、相干性、光学跃迁和发射光谱进行了详细分析。此外，我们研究了这两种声子退相干机制对二分纠缠和系统混合度的影响。特别是，我们的研究结果表明，当声子吸收和发射的不平衡显著时，声子辅助隧穿机制会部分影响系统的相干性和量子特性。相反，纯退相机制不影响布居数，但会强烈地使量子点与库纠缠，诱导出最大混合态，并显著减小系统发射光谱中的光谱分裂。
