We investigate the pairwise quantum correlations in standard Gisin states and in Gisin states based on bipartite spin-coherent states by employing quantum negativity and quantum local uncertainty as bona fide quantum correlations measures. Gisin states are defined as mixtures of separable mixed states and some pure entangled ones. We compare the behavior of the two quantifiers of Gisin states and we find that both measures exhibit a sudden change in terms of the mixing parameter. Furthermore, we show that entangled Gisin states contain nonclassical correlations that are captured by the local quantum uncertainty and cannot be revealed by the negativity quantifier.

中文翻译：

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通过吉辛状态的局部量子不确定性与负性

我们通过采用量子负性和量子局部不确定性作为真正的量子相关性度量来研究标准吉辛态和基于二分自旋相干态的吉辛态中的成对量子相关性。吉辛态被定义为可分离混合态和一些纯纠缠态的混合物。我们比较了 Gisin 状态的两个量词的行为，我们发现这两种测量在混合参数方面都表现出突然的变化。此外，我们表明纠缠的吉辛状态包含非经典相关性，这些相关性被局部量子不确定性捕获，并且不能被负量词揭示。