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arXiv 1809.01176quant-ph
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用快速阻尼辅助模产生二分导向相关

Creation of bipartite steering correlations by a fast damped auxiliary mode

Li-hui Sun, Kai-Kai Zhang, Feng Xia, Bin Hu, Fang Chen, Chun-Chao Yu

摘要:

我们考虑一个三模系统,并显示如何转向相关性可以创建两个模式的系统使用的第三模式的快速耗散之间。这些关联导致了一种方向性的纠缠,称为量子或EPR转向。我们说明这阻尼辐射模式之间的相互作用的光机械三模式系统的例子。通过假设其中一个模式经历快速耗散,我们证明了该模式与系统的一个或两个其他模式的耦合可能导致单向或双向量子转向。给出了转向参数的显式分析结果。我们发现,两个模式耦合的参数型相互作用和阻尼相同的速率可以纠缠,但不能表现出量子转向。此外,当其中一个模式耦合到快速阻尼模式时,产生转向相关性,然后模式表现出单向转向。在模式的正交分量的方差的上下文中解释导向相关性的创建,即导向相关性由辅助模式引起的模式的正交分量的方差的不对称性引起。结果表明,涨落的作用是有方向性的,只有当操纵模的方差大于操纵模的方差时,才可能发生量子操纵。该计划被证明是相当强大的对热激励的模式,如果操纵模式的波动大于操纵模式的波动。

英文摘要:

We consider a three-mode system and show how steering correlations can be created between two modes of the system using the fast dissipation of the third mode. These correlations result in a directional form of entanglement, called quantum or EPR steering. We illustrate this on examples of the interactions among damped radiation modes in an optomechanical three-mode system. By assuming that one of the modes undergoes fast dissipation, we show that the coupling of that mode to one or two other modes of the system may result in one- or two-way quantum steering. Explicit analytical results are given for the steering parameters. We find that two modes coupled by the parametric-type interaction and damped with the same rates can be entangled but cannot exhibit quantum steering. When, in addition, one of the modes is coupled to a fast damped mode, steering correlations are created and the modes then exhibit one-way steering. The creation of the steering correlations is interpreted in the context of the variances of the quadrature components of the modes that the steering correlations result from an asymmetry in the variances of the quadrature components of the modes induced by the auxiliary mode. It is found that the fluctuations act directionally that quantum steering may occur only when the variance of the steering mode is larger that the variance of the steered mode. The scheme is shown to be quite robust against the thermal excitation of the modes if the fluctuations of the steering mode are larger than the fluctuations of the steered mode.

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