摘要
考虑系统粒子的弛豫,利用密度矩阵运动方程,研究了线性啁啾脉冲作用下二能级系统的粒子布居几率随时间的演化情况,并在布洛赫矢量模型表象下,通过布洛赫矢量的动态演化过程分析了粒子相干布居转移过程中布居振荡的物理机理。结果表明,粒子数振荡反映的是二能级原子系统中粒子布居转移、色散和吸收三者之间的动态转化过程。
The time evolution of population probability in two-level system under a linear frequency-chirped field is studied by mean of the density matrix equation of motion when the decay of the excited state is considered, and the physical mechanism of the oscillation in the process of the population transfer is analyzed using the dynamic evolution process of the Bloch vector under the picture of Bloch vector model. The result shows that the phenomenon of oscillation in the two-level system reveals the dynamic conversion transfer among population transfer, dispersion and absorption.
出处
《北京联合大学学报》
CAS
2008年第3期78-81,共4页
Journal of Beijing Union University
基金
宁厦自然科学基金资助项目(NZ08173)
