实现低功率下光与原子高效相互作用一直是量子光学研究的长远目标，它被广泛的用于单光子源的制备和存储、全光开关、量子中继器等研究。然而弱光下光与原子的相互作用非线性系数非常低，使得相关研究成为这些领域的难点问题，限制着量子信息和量子测量研究的发展，受到众多科研学者的关注。本项目针对这一问题，结合申请人及参与人在相关方向的理论和实验研究上的经验积累，运用相干量子调控技术提出了新型有效的实验方案。其原理是通过在原子系综中制备具有量子关联的光场和原子态，利用这个光子-原子量子关联以及相干反馈机制来提高低功率下光场与原子非线性相互作用的强度，从而提高光与原子相互作用系数，并且可以降低作用过程中产生的信号光的噪声水平和限制信号光场的空间模式。本项目的研究成果为低功率下的非线性相互作用提供了一种切实可行的新思路和方法，发展了一些新的实验技术。

At low light intensity, the efficient interaction between light and atoms is a long-standing goal of quantum optics research. It is widely used for generation and storage of single-photon source, all optical switch, quantum repeater and so on. However, the nonlinear coefficient between the weak light field and atoms is very low and hard to be solve. The low nonlinear coefficient limits the development of quantum information and quantum measurement research. The related research attracts the attention of numerous scientific researchers. Based on the quantum optics experience of the applicant and the participants, we propose a new experimental scheme using coherent quantum manipulation technology. By preparing the quantum correlated light field and atomic spin wave, the quantum correlation and coherent feedback mechanism can improve the interaction coefficient between light field and atoms at low power intensity. At the same time, the scheme also reduces the noise level of signal light field and cleans up the spatial modes of the signal light field. The results of the program provide a practical and feasible new method to solve the problem and develop some experimental technology.