双模压缩相干态光场与二能级原子玻色-爱因斯坦凝聚体相互作用系统中原子激光的压缩效应

Squeezing Properties of Atomic Laser in Two-Mode Squeezed Field Interaction with Bose-Einstein Condensate of Two-Level Atoms

应用全量子理论,通过求解系统的海森堡方程,研究了双模压缩相干态光场与二能级原子玻色-爱因斯坦凝聚体(BEC)相互作用系统中原子激光的压缩效应,讨论了原子-光场耦合系数,原子间相互作用强度对压缩频率、压缩深度的影响。结果表明,原子激光两个正交分量周期性地被压缩,压缩持续时间依赖于原子-光场耦合系数和原子间相互作用强度;最大压缩深度依赖于原子间相互作用强度和光场初始压缩因子。

The squeezing properties of atomic laser are studied in two-mode squeezed field interaction with Bose-Einstein condensate （BEC） of two-level atoms within rotating-wave approximation by solving the Heisenberg equation and based on the entire quantum theory.The influence of the interaction among atoms in BEC and the coupling constant between light field and atoms on the depth and duration of squeezing is investigated.The results show that two quadrature components of atomic laser can be squeezed periodically.The duration of squeezing atomic laser depends closely on both the interaction among atoms in BEC and the coupling constant between light field and atoms.The depth of squeezing atomic laser is determined by both the interaction among atoms and the initial squeezing factor of light.