量子非局域性是量子力学最神奇的特性之一，它的表现形式包括量子纠缠、量子导引、量子失协和贝尔非局域性等。量子导引是指对一个系统的测量会瞬间影响远处另一个系统，它是介于量子纠缠和贝尔非局域性之间的一种特殊量子非局域性，无法用局域隐态模型来解释。量子导引具有独特的非对称性，可以实现单向的量子导引过程。利用准相位匹配技术，可以在一块光学超晶格中通过级联的非线性过程产生多个输出光场，这些光场在一定条件下也可能存在量子导引关联。本项目在前期研究量子纠缠工作的基础上，根据量子导引关联的判定方法，将从理论上研究级联非线性过程产生的多个光场之间的量子导引关联特性，探讨量子导引产生的物理机制以及量子导引关联和量子纠缠之间相互转化的条件。通过本项目的研究，将为实验上制备非对称两组份和多组份不同频率的量子导引关联提供切实可行的方案。不同类型量子非局域特性的研究，将为量子系统在未来技术中的各种新奇应用开辟新的道路。

Quantum nonlocality is one of the most magical properties of quantum mechanics. Its manifestations include quantum entanglement, quantum steering, quantum discord and Bell nonlocality. Quantum steering is a special quantum nonlocality between quantum entanglement and Bell nonlocality, which can not be explained by the local hidden state model. Quantum steering has unique asymmetry and can realize unidirectional quantum steering process. Using quasi-phase matching technique, multiple output optical fields can be generated in an optical superlattice through cascaded nonlinear processes, which may also have quantum steering correlation under certain conditions. Based on the previous work on quantum entanglement, according to the judgment method of quantum steering correlation, this project will theoretically study the quantum steering correlation between multiple optical fields generated by cascaded nonlinear processes, and discuss the physical mechanism of quantum steering, as well as the conditions of quantum steering correlation and quantum entanglement transformation. Through the research of this project, it will provide a feasible scheme for the preparation of asymmetric bipartite and multipartite quantum steering correlation with different frequencies. The study of different types of quantum nonlocal properties will open up a new way for novel applications of quantum systems in future technology.