可见的
度量(数据仓库)
二部图
量子层析成像
物理
量子位元
量子
量子态
密度矩阵
统计物理学
量子力学
量子不和谐
数学
开放量子系统
离散数学
计算机科学
图形
数据库
作者
Davide Girolami,Gerardo Adesso
标识
DOI:10.1103/physrevlett.108.150403
摘要
We introduce a measure $Q$ of bipartite quantum correlations for arbitrary two-qubit states, expressed as a state-independent function of the density matrix elements. The amount of quantum correlations can be quantified experimentally by measuring the expectation value of a small set of observables on up to four copies of the state, without the need for a full tomography. We extend the measure to $2\ifmmode\times\else\texttimes\fi{}d$ systems, providing its explicit form in terms of observables and applying it to the relevant class of multiqubit states employed in the deterministic quantum computation with one quantum bit model. The number of required measurements to determine $Q$ in our scheme does not increase with $d$. Our results provide an experimentally friendly framework to estimate quantitatively the degree of general quantum correlations in composite systems.
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