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arXiv 0910.1745quant-ph
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定向量子通信

Directed quantum communication

Johan Aberg, Stefan Hengl, Renato Renner

摘要:

我们提出的问题是,是否有一种方法来表征介质或材料的量子信息传输特性。对于这种分析,必须考虑到量子信息的特殊性。我们发现,在各向同性介质上的量子通信,而不是经典的信息传输,需要发送器直接向接收器的信号。此外,对于大类媒体,有一个阈值,即必须收集“足够多”的信号。因此,介质的量子通信能力可以根据发射器和接收器的大小如何与传输距离成比例来表征,以保持量子信息传输。为了证明这一概念的适用性,我们考虑了一个n维自旋晶格,得到了d^(n/3)与距离d的充分比例。

英文摘要:

We raise the question whether there is a way to characterize the quantum information transport properties of a medium or material. For this analysis the special features of quantum information have to be taken into account. We find that quantum communication over an isotropic medium, as opposed to classical information transfer, requires the transmitter to direct the signal towards the receiver. Furthermore, for large classes of media there is a threshold, in the sense that `sufficiently much' of the signal has to be collected. Therefore, the medium's capacity for quantum communication can be characterized in terms of how the size of the transmitter and receiver has to scale with the transmission distance to maintain quantum information transmission. To demonstrate the applicability of this concept, an n-dimensional spin lattice is considered, yielding a sufficient scaling of d^(n/3) with the distance d.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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