The Quantum Coherence Effects in Degenerate Two-level Atomic System

Guo-Mo Zeng

Quantum coherence effects in degenerate cascade three-level atom subject to magnetic field are investigated.One-photon EIT,two-photon EIT and two-photon EIA are obtained,due to the coherence between the drive Rabi frequency and Zeeman splitting.

Daniel F. Walls

Peng Shi-kun

When the transitions connected by two nearly degenerate ground levels with an intermediate level in a five-level K-type atom interact with the same vacuum radiation field,between which the quantum interference leads to vacuum-induced coherence.We find that the vacuum-induced coherence make inportant effects on single-and two-photon transparency in the five-level K-type atomic system.

Chang Su

A.M. Abdel-Hafez

We investigate the phenomenon of degenerate and nondegenerate two-mode squeezing for a generalized Jaynes-Cummings model with a two-level atom and two modes. The effect of the relative phases between the atomic superposition state and the coherent field on normal squeezing is studied. Different values for the parameters of the atomic coherent state are taken. It is found that the nondegenerate two-mode squeezing is more effective than the one-mode degenerate type, and it recurs at later times.

Ting Yu