量子环中量子比特的性质

通过精确求解能量本征方程获得量子环的电子能态，并利用电子的基态和第一激发态构造一个量子比特.对InAs/GaAs量子环的数值计算表明：当环尺寸给定时，量子比特内电子的概率密度分布与坐标位置及时间有关，在环内中心位置处电子出现的概率最大，电子的概率密度随柱坐标内的转角作周期性变化，并且各个空间点处的概率密度均随时间做周期性振荡. 关键词： 量子环 能量本征方程 电子能态 量子比特

Properties of quantum bit in quantum ring

Electronic states of quantum ring are obtained by solving precisely the energy eigen-equation and a quantum bit is formed by both the ground state and the first excited state of the electron in the quantum ring. The numerical results for InAs/GaAs quantum ring indicate that when the size of quantum ring has been determined, the probability density distribution of an electron is related to its position in the quantum ring and time, there is a maximum of probability density for the given angle and time, and the probability density distribution of electron makes periodical oscillations in time and space.