标题： 量子信息作为多体关联的度量 显示英文标题

标题： Quantum Information as a Measure of Multipartite Correlation

摘要： 互信息已被成功用作量子系统之间关联强度的度量，尤其是在双部分系统中。 在这里，我们研究这种度量在多部分量子系统中的应用。 对于量子比特系统，我们发现‘经典’和‘量子’关联强度区域之间的差异最多仅为1比特的信息。 我们展示了关联的信息含量可以扩展为成对组分之间的关联，并证明就基于这种信息的关联度量而言，GHZ态是唯一同时优化量子比特系统中这些成对关联的状态。 显示英文摘要

摘要： The mutual information has been successfully used as a measure of correlation strength between quantum systems, especially for bipartite systems. Here we examine the use of this measure for multipartite quantum systems. For system of qubits we find that the difference between `classical' and `quantum' regimes of correlation strength amounts to just 1 bit of information, at most. We show that the information content of a correlation can be expanded into correlations between pairwise components and demonstrate that in terms of this information-based measure of correlation the GHZ states are the only states that simultaneously optimize these pairwise correlations for systems of qubits.