Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau cedex, France.
Opt Lett. 2013 Jun 1;38(11):1963-5. doi: 10.1364/OL.38.001963.
We have implemented the Gedanken experiment of an individual atom scattering a wave packet of near-resonant light, and measured the associated Wigner time delay as a function of the frequency of the light. In our apparatus, the atom behaves as a two-level system and we have found delays as large as 42 ns at resonance, limited by the lifetime of the excited state. This delay is an important parameter in the problem of collective near-resonant scattering by an ensemble of interacting particles, which is encountered in many areas of physics.
我们已经实现了单个原子散射近共振光的波包的思维实验，并测量了与光频率有关的关联维格纳时滞。在我们的装置中，原子表现为一个两能级系统，我们在共振时发现了长达 42 纳秒的延迟，这是由激发态的寿命限制的。这个延迟是许多物理领域中遇到的由相互作用粒子集体近共振散射问题的一个重要参数。
