Selecting the double-parameter asymmetric Gaussian (AG) potential to describe the confinement effects of electrons in quantum dot (QD), the effect of dielectric constant, dispersion and polarization on the properties of the QD qubit is studied by LLP–Pekar transformation variation method. By discussing the oscillation period of the qubit with the AG potential, the mechanism of influence of the material parameters such as the dielectric constant ratio and the electron–phonon coupling (EPC) constant on qubit survival time and information storage is clarified. Based on the Fermi gold rule and the even-order approximation, the qubit decoherence with AG potential is studied. It is revealed that increasing the dielectric constant ratio, the dispersion or the EPC constant of materials is all ways to solve the qubit decoherence due to spontaneous emission of phonons. The theoretical basis for phase rotation control of qubit spheres is given by improving dispersion coefficient or dielectric constant ratio of materials.

选择双参数非对称高斯（AG）势来描述电子在量子点（QD）中的约束效应，通过LLP-Pekar变换变异法研究介电常数，色散和极化对QD量子比特性质的影响。通过讨论具有AG电位的量子位的振荡周期，阐明了介电常数比和电子-声子耦合（EPC）常数等材料参数对量子位生存时间和信息存储的影响机理。基于费米黄金定律和偶数阶近似，研究了具有AG电势的量子比特去相干。发现增加介电常数比，材料的色散或EPC常数是解决由于声子自发发射引起的量子比特去相干的所有方法。通过改善材料的色散系数或介电常数比，为量子位球的相位旋转控制提供了理论基础。