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arXiv 1302.7034quant-ph
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通过Schatten 1-范数的几何量子不协调

Geometric quantum discord through the Schatten 1-norm

F. M. Paula, Thiago. R. de Oliveira, M. S. Sarandy

摘要:

最近有人指出,由希尔伯特-施密特范数(2-范数)定义的几何量子不和谐不是量子关联的良好度量,因为它可能在不可测子系统上的局部可逆操作下增加。在这里,我们通过考虑一般的Schatten p-范数来重新审视几何不和谐,明确表明1-范数是唯一能够定义一致量子相关测度的p-范数。此外,通过将优化限制在两量子比特Bell对角态的四面体上,我们给出了1-范数几何不协调的解析表达式,它等价于量子性的负性。我们通过分析其单调性来说明该测度。

英文摘要:

It has recently been pointed out that the geometric quantum discord, as defined by the Hilbert-Schmidt norm (2-norm), is not a good measure of quantum correlations, since it may increase under local reversible operations on the unmeasured subsystem. Here, we revisit the geometric discord by considering general Schatten p-norms, explicitly showing that the 1-norm is the only p-norm able to define a consistent quantum correlation measure. In addition, by restricting the optimization to the tetrahedron of two-qubit Bell-diagonal states, we provide an analytical expression for the 1-norm geometric discord, which turns out to be equivalent to the negativity of quantumness. We illustrate the measure by analyzing its monotonicity properties.

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