Optimal measurement on noisy quantum systems.
Optimal measurement on noisy quantum systems.
复制标题
DOI：
10.1103/physrevlett.104.020401
复制
发表时间：
2009-06
影响因子：
8.6
通讯作者：
Yu Watanabe;T. Sagawa;Masahito Ueda
中科院分区：
文献类型：
--
作者：
Yu Watanabe;T. Sagawa;Masahito Ueda
我们确定了在待测量的量子态因噪声而经历部分退相干之后，获取有关原始量子态信息的最佳测量方法。我们根据费希尔信息对通过测量可获得的信息进行量化，并求出最佳测量的该信息值。我们将我们的结果应用于一个基于自旋 - 玻色子模型的量子控制方案。
We identify the optimal measurement for obtaining information about the original quantum state after the state to be measured has undergone partial decoherence due to noise. We quantify the information that can be obtained by the measurement in terms of the Fisher information and find its value for the optimal measurement. We apply our results to a quantum control scheme based on a spin-boson model.