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中国物理学会期刊

基于级联四波混频过程的量子导引

CSTR: 32037.14.aps.70.20201981

Quantum steering based on cascaded four-wave mixing processes

CSTR: 32037.14.aps.70.20201981
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  • 多组份量子导引是一种重要的量子资源, 是安全量子通信网络的基础. 本文设计了串联级联四波混频和混合级联四波混频两种不同的方案, 并基于这两种方案分别产生了三组份量子导引和五组份量子导引, 通过构建系统量子态的协方差矩阵, 理论研究了两种方案产生不同模式组合间的导引参数随四波混频过程振幅增益的变化. 结果表明, 利用这两种方案可以实现多种类型的量子导引, 这一结果不仅有助于理解量子导引在多组份系统的分布而且在实际的安全量子通信网络中具有重要的意义.

     

    Multipartite quantum steering is an important quantum resource and the basis of secure quantum communication network. Multipartite quantum steering can be generated by beam splitter networks, optical frequency comb systems and nonlinear processes. Different types of quantum steering will be produced by different projects. In this paper, we design two different schemes, i.e. series cascaded four-wave mixing and hybrid cascaded four-wave mixing, and based on these two schemes tripartite quantum steering and quinquepartite quantum steering are generated respectively. The steering characters among different users are quantified based on the covariance matrix. In theory, we investigate steering parameters among different modes created by two schemes versus the amplitude gain of four-wave mixing process. We find that one mode can steer the other two modes separately, but the other two modes cannot steer the one mode simultaneously. By comparing the steering characters of joint multimodes to a certain single mode with the individual mode to the single mode respectively, it can be seen that the steerability of the former is stronger than the latter in the whole gain region, and there exists only the steering of joint multimodes to a single mode in the partial gain region. More importantly, the steerability of joint multimodes to a single mode can be enhanced with the quantity of joint multimodes increasing. The results show that multiple types of quantum steering can be realized by using these two schemes, which are helpful in understanding the distribution of quantum steering in multipartite system and have important significance in practical secure quantum communication and quantum secret sharing.

     

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