数据处理使得POVM更粗糙,观测熵更大
Data processing makes POVMs coarser and observational entropies larger
摘要:
我们找到了一个标准来比较POVM测量,并决定哪些可以从物理系统中提取更多的信息,与粗糙的POVM总是提取较少的信息。该标准概括了先前对较粗POVM的定义,并且是由信息不能通过处理测量结果来获得的想法所激励的。测量无法提取的信息通过观测熵或粗粒度熵来量化。因此,较粗糙的测量具有较大的观测熵。此外,我们提供的粗测量的表征和属性允许直接导出几个先前已知的观测熵的结果。
英文摘要:
We find a criterion to compare POVM measurements and decide which ones can extract more information from physical systems, with coarser POVMs always extracting less information. This criteria generalizes the previous definition of coarser POVM, and is motivated by the idea that information cannot be gained by processing the measurement outcomes. The information that a measurement cannot extract is quantified by observational entropy or coarse-grained entropy. Adequately, coarser measurements have larger observational entropies. Moreover, the characterization and properties of coarser measurements that we provide allow to straightforwardly derive several previously known results about observational entropy.
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