A semiconductor heterostructure made with two asymmetric coupled self-assembled quantum dots (ACSAQDs) has been studied. Such a structure can serve as a spin based quantum dot qubit which is an important manufacture for quantum communication and quantum information processing. The shape of the confinement potential, the used semiconductor materials and the size of the investigated quantum dots have been chosen to be comparable to the fabricated and the experimentally studied quantum dots. The spin-flip decoherence and more specifically the effects associated with acoustic phonons have been researched. A rather sophisticated theoretical model (8-band strain dependent k ⋅p theory) has been employed to evaluate the carrier eigenfunctions and eigenvalues within the quantum dots. Using the Fermis golden rule, the spin-flip relaxation time (T₁) due to phonon coupling to electrons has been evaluated. The volume of the quantum dots is a parameter of crucial importance for controlling the spin-flip relaxation mechanism. Moreover, other parameters like the space between the coupled quantum dots, the lattice temperature and the presence of an external applied magnetic field (along the quantum dots growth direction) have considerable effects on the spin-flip relaxation time.

研究了由两个不对称耦合的自组装量子点（ACSAQD）制成的半导体异质结构。这样的结构可以用作基于自旋的量子点量子位，这是用于量子通信和量子信息处理的重要制造。选择了限制电位的形状，使用的半导体材料和所研究的量子点的大小，以便与制造的和实验研究的量子点相比较。已经研究了自旋翻转退相干，更具体地说是与声子相关的效应。一个相当复杂的理论模型（8频带应变依赖性ķ ⋅ p理论）已被用来评估量子点内的载流子本征函数和本征值。使用费米黄金法则，评估了由于声子耦合到电子而引起的自旋翻转弛豫时间（T ₁）。量子点的体积是控制自旋翻转弛豫机制至关重要的参数。此外，其他参数，如耦合量子点之间的间距，晶格温度和外部施加磁场的存在（沿量子点的生长方向），对自旋翻转弛豫时间有很大影响。