基于增强拉曼散射的光子-原子双模压缩态的实现

Generation of two-mode photon-atom quadrature squeezing based on enhanced raman scattering

拉曼散射过程中利用原子系综中初始制备的自旋激发(原子相干性),以及注入与原子系综中初始制备的自旋激发相关联的种子光场都可以极大的提高光场频率转换的效率,实现增强拉曼散射.本文理论上计算了增强拉曼散射过程中原子-光场量子界面的正交分量的量子起伏,得到了相干性导致的增强拉曼散射,只能在一定的范围内稍微提高初始光子-原子的压缩度;而关联增强拉曼散射,能够制备很强的光子-原子间的双模压缩.这样强压缩度的光子-原子量子界面,对于利用光场和原子系统实现量子精密测量研究有着非常重要的应用.

Enhanced Raman scattering can be obtained by the initially prepared atomic spin excitation,or by injecting a seeded light feld which is correlated with the initially prepared atomic spin excitation.This paper theoretically calculated the quantum fuctuations of the quadrature components of the two-mode photon-atom quantum interface and found that the enhanced Raman scattering based on coherence can improve the initial photon-atom squeezing slightly in a certain scope,and correlation-enhanced Raman scattering can produce strong two-mode squeezing of photon-atom.Such a strong two-mode squeezed state at the photon-atom interface has very important applications in precision measurement research based on the light feld and atomic system.