抛物量子点中的二能级体系(英文)  

Two-level system of a parabolic quantum dot

作　　者：王启文[1] 红兰[1] 

机构地区：[1]呼伦贝尔学院物理与电子信息学院,内蒙古海拉尔021008

出　　处：《量子电子学报》2011年第1期110-114,共5页Chinese Journal of Quantum Electronics

基　　金：Project supported by Natural Science Foundation of Inner Mongolia(NJ09178)

摘　　要：采用Pekar类型的变分方法,在抛物量子点中电子与体纵光学声子(LO)强耦合的条件下,得出了电子的基态,第一激发态的能量及相应的波函数。讨论了电子-声子耦合强度,量子点受限长度对电子在基态|0>,激发态|1>,叠加态1/2^(2/1)(|0>+|1>)时的概率密度分布的影响。结果显示叠加态时的概率密度随着电子-声子耦合强度的增加而增大,随着量子点受限长度的减小而增大。该结果对以量子点制备量子比特有一定的指导意义。On the condition of electron-LO phonon strong coupling in a parabolic quantum dot, the eigenenergies and eigenfuctions of the ground state and first excited state using variational method of Pekar type were obtained. The system in quantum dot may be employed as a two-level quantum system qubit. The relations on the electron-LO phonon strong coupling, the confinement length with the electron probability density were investigated. The results indicate that the electron probability density increases with increasing the electron-LO phonon strong coupling and decreasing the confinement length. The results are meaningful for preparing a qubit.

关 键 词：量子信息 二能级体系 变分法 量子点 

分 类 号：O471.3[理学—半导体物理]