Opt Express. 2023 Mar 27;31(7):11775-11787. doi: 10.1364/OE.486260.
Multipartite Einstein-Podolsky-Rosen (EPR) steering has been widely studied, for realizing safer quantum communication. The steering properties of six spatially separated beams from the four-wave-mixing process with a spatially structured pump are investigated. Behaviors of all (1+i)/(i+1)-mode (i=1,2,3) steerings are understandable, if the role of the corresponding relative interaction strengths are taken into account. Moreover, stronger collective multipartite steerings including five modes can be obtained in our scheme, which has potential applications in ultra-secure multiuser quantum networks when the issue of trust is critical. By further discussing about all monogamy relations, it is noticed that the type-IV monogamy relations, which are naturally included in our model, are conditionally satisfied. Matrix representation is used to express the steerings for the first time, which is very useful to understand the monogamy relations intuitively. Different steering properties obtained in this compact phase-insensitive scheme have potential applications for different kinds of quantum communication tasks.
多体爱因斯坦-波多尔斯基-罗森（EPR）导引已被广泛研究，用于实现更安全的量子通信。研究了具有空间结构泵的四波混频过程中六个空间分离光束的导引性质。如果考虑到相应的相对相互作用强度的作用，则可以理解所有（1+i）/（i+1）-模式（i=1,2,3）的导引行为。在我们的方案中，可以获得包括五个模式的更强的集体多体导引，当信任问题至关重要时，它在超安全多用户量子网络中有潜在的应用。通过进一步讨论所有的单模关系，注意到我们模型中自然包含的第四类单模关系是有条件满足的。首次使用矩阵表示来表示导引，这对于直观地理解单模关系非常有用。在这个紧凑的无相位灵敏度方案中获得的不同导引性质可应用于不同种类的量子通信任务。
