标题： 关于单光子波包与激发原子的相互作用 显示英文标题

标题： On the interaction of a single-photon wave packet with an excited atom

摘要： 研究了自由空间中一个初始激发的两能级原子与单光子波包的相互作用，在半经典和量子方法中进行了分析。 结果显示，场的最终状态不包含双占据模式。 原子跃迁到基态的过程可能被入射光子加速、减速甚至逆转，这取决于参数。 发射辐射的谱线接近入射单光子波包谱线和自然线形的总和，但存在微小而复杂的偏差。 显示英文摘要

摘要： The interaction of a single-photon wave packet with an initially excited two-level atom in free space is studied in semiclassical and quantum approaches. It is shown that the final state of the field does not contain doubly occupied modes. The process of the atom's transition to the ground state may be accelerated, decelerated or even reversed by the incoming photon, depending on parameters. The spectrum of emitted radiation is close to the sum of the spectrum of the incoming single-photon wave packet and the natural line shape, with small and complicated deviations.