研究进展:非局域的非互易性

非互易性在信息控制中是十分重要的,常见的器件有二极管、磁光器件等。在很多的量子系统中也发现了非互易的存在,而非局域性又是量子的特有的性质之一;如果将二者结合起来便可以构造不局限于空间的非局域器件,这种器件不再是像经典的二极管那样的局域化的控制器件,而是由相距很远又有着量子关联的两个或者多个端口构成,其间的关联不再需要任何的介质或者传递者,这类似于量子通讯,所不同的是我们不是用于传递信息,而是执行非局域的量子操作或者用于控制量子信息网络的传输,例如,我们可以将制备好的非局域器件控制端放在自己手上,而受控端可以丢在宇宙的任何一个角落,只需要保证其相干性,便可以执行超越空间的控制操作。

这个工作计算量比较大,但计算上没有太大的难度,非局域性的证明需要一点小技巧。个人觉得挺有意思的,学生着急毕业并未太仔细打磨,刊物发表上有些遗憾。

论文摘要:A nonlocal circulator protocol is proposed in hybrid optomechanical system. By analogy with quantum communication, using the input-output relationship, we establish the quantum channel between two optical modes with long-range. The three body nonlocal interaction between the cavity and the two oscillators is obtained by eliminating the optomechanical cavity mode and verifying the Bell-CHSH inequality of continuous variables. By introducing the phase accumulation between cyclic interactions, the unidirectional transmission of quantum state between optical mode and two mechanical modes are achieved. The results show that nonreciprocal transmissions are achieved as long as the accumulated phase reaches a certain value. In addition, the effective interaction parameters in our system are amplified, which reduces the difficulty of the implementation of our protocol. Our research can provide potential applications for nonlocal manipulation and transmission control of quantum platforms.

文章链接:https://arxiv.org/abs/2112.09935