Three-Level Atoms:

Dieter Suter

Feifan Liu, Mao-Fa Fang, Xiong Xu

The entropy squeezing for a three-level atom interacting with a single-model field is studied. A general definition of entropy squeezing for three-level atom is given according to entropic uncertainty relation of three-level system, and the calculation formalism of entropy is derived for a cascade three-level atom. By using numerical calculation, the entropy squeezing properties of a cascade three-level atom are examined. Our results show that, three-level atom can generate obvious entropy squeezing effect via choosing appropriate superposition state of three-level atom. Our results are meaningful for preparing three-level system information resources with ultra-low quantum noise.

Zhi‐Ming Zhang, Shikang Zhou, Yuxing Xia +2 more

The transmission probability of an ultracold cascade three-level atom through a micromaser cavity is calculated and analyzed. It is shown that the micromaser cavity can be used as a velocity selector for ultracold three-level atoms, and the velocity selectivity is better for three-level atoms than for two-level atoms.

Robert J. Bettles

Robert J. Bettles

Xiong Zhi-bin, Zeng Gao-jian

The energy level decay terms are introduced into the Schrdinger equation of a three-level atom in an electromagnetic field of circular polarization. By means of modulating frequency of a circularly polarized electromagnetic field and approximation of a strong laser, three special states of three kinds of three-level atom are discovered. Based on these special states, we further study the atom-lifetime of three-level atom in a circularly polarized electromagnetic field.