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arXiv quant-ph/0108037quant-ph
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有限资源下量子信道的估计

Estimation of quantum channels with finite resources

Markus A. Cirone, Aldo Delgado, Dietmar G. Fischer, Matthias Freyberger, Holger Mack, Michael Mussinger

摘要:

我们研究了确定描述量子信道的参数的问题。它是假设,用户的信道最多只有部分的知识,它和利用有限的资源来估计it.We讨论简单的协议,在目前的文献中研究的几类信道的参数估计。我们定义了两种不同的定量测量的质量的估计方案,一个基于标准差,另一个的保真度。还考虑了使用纠缠粒子的协议的可能性。结果表明,利用纠缠粒子作为一种新的非经典资源,可以提高某些类型量子信道的估计质量。此外,所研究的方法使我们能够将其扩展到更高维的量子系统。

英文摘要:

We investigate the problem of determining the parameters that describe a quantum channel. It is assumed that the users of the channel have at best only partial knowledge of it and make use of a finite amount of resources to estimate it. We discuss simple protocols for the estimation of the parameters of several classes of channels that are studied in the current literature. We define two different quantitative measures of the quality of the estimation schemes, one based on the standard deviation, the other one on the fidelity. The possibility of protocols that employ entangled particles is also considered. It turns out that the use of entangled particles as a new kind of nonclassical resource enhances the estimation quality of some classes of quantum channel. Further, the investigated methods allow us to extend them to higher dimensional quantum systems.

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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