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arXiv quant-ph/0207150quant-ph
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不可微模型的量子估计

Quantum estimation for non-differentiable models

Yoshiyuki Tsuda, Keiji Matsumoto

摘要:

状态估计是量子信息中的一个经典问题。在估计方案的优化中,寻找估计量误差的下界是一个非常重要的步骤。到目前为止,所有提出的易于处理的下界使用的密度矩阵的导数。然而,有时,我们感兴趣的数量与奇异性,如并发等,在文件中,下界估计的均方误差(MSE)的量子估计问题,没有光滑性假设。我们的主要思想是用差分代替导数,就像经典估计理论中所做的那样。我们将不等式应用到几个例子中,并导出了其中一些的最优估计。

英文摘要:

State estimation is a classical problem in quantum information. In optimization of estimation scheme, to find a lower bound to the error of the estimator is a very important step. So far, all the proposed tractable lower bounds use derivative of density matrix. However, sometimes, we are interested in quantities with singularity, e.g. concurrence etc. In the paper, lower bounds to a Mean Square Error (MSE) of an estimator are derived for a quantum estimation problem without smoothness assumptions. Our main idea is to replace the derivative by difference, as is done in classical estimation theory. We applied the inequalities to several examples, and derived optimal estimator for some of them.

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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