Physics – Quantum Physics
Scientific paper
2004-10-18
Phys. Lett. A 355, 437 (2006)
Physics
Quantum Physics
14pages, 2figures, Phys. Lett. A, In print
Scientific paper
10.1016/j.physleta.2006.02.031
We study in detail the interesting dynamical symmetry and its applications in various atomic systems with electromagnetically induced transparency (EIT) in this paper. By discovering the symmetrical Lie group of various atomic systems, such as single-atomic-ensemble composed of complex $m$-level $(m>3)$ atoms, and $two$-atomic-ensemble and even multi-atomic-ensemble system composed of of $three$-level atoms etc., one can obtain the general definition of dark-state polaritons (DSPs), and then the dark-states of these different systems. The symmetrical properties of the multi-level system and multi-atomic-ensemble system are shown to be dependent on some characteristic parameters of the EIT system. Furthermore, a controllable scheme to generate quantum entanglement between lights or atoms via quantized DSPs theory is discussed and the robustness of this scheme is analyzed by confirming the validity of adiabatic passage conditions in this paper.
Ge Mo-Lin
Jing Hui
Liu Xin
Liu Xiong-Jun
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