空间分离的路径纠缠微波信号制备方案

Review of Approaches on Generating Spatially Separated Path Entangled Microwave Signal

从利用纠缠信号替代无线电信号打破经典限制来提升信息系统性能的目的出发,首先阐明了发展纠缠微波技术的必要性,并回顾了路径纠缠微波制备的发展历程。其次,总结了4种现有路径纠缠微波信号制备方案:利用超导180°混合环、威尔金森功分器、约瑟夫森参量转换器和微波频段Hong-Ou-Mandel效应的制备方案。在对所使用的微波分束器进行详细描述的基础上,分别从实验装置和基本原理2个方面,采用对比分析的方法,对现有路径纠缠微波信号制备方案进行了剖析,继而给出了各个方案所生成路径纠缠微波信号的表达式。最后对各个方案的优、缺点进行了具体分析,总结了制约量子纠缠微波技术发展的主要因素,指明了其广阔的发展前景,并对制备路径纠缠微波信号未来的研究方向进行了展望。

Proceed from promoting the performance of information systems by utilizing the entangled signals for replacing the radio signals,firstly,this paper illuminates the necessity of developing entanglement microwave technologies and reviews the history of generating path entangled microwave signal,and then concludes four available path entangled microwave signal generation setups by utilizing superconducting180°hybrid ring,Wilkinson power divider,Josephson parametric converter and Hong-Ou-Mandel effect in microwave domain,respectively.On the basis of the detail description of microwave beam splitter used in each setup,from aspects of the experimental facility and the ultimate principle of setups that is available,path entangled microwave signal generation setups are analyzed by means of contrast analysis,and the expression of these signal generated in each setup is stated.At the last part of the paper,there is a concrete analysis about advantages and drawbacks of each setup,and a brief summary about the major limitations of developing entanglement microwave technologies.The paper clearly points out the development prospect.And an outlook about future research of path entangled microwave signal＇s generation is stated.