Top quarks have been recently shown to be a promising system to study quantum information at the highest-energy scale available. The current lines of research mostly discuss topics such as entanglement, Bell nonlocality or quantum tomography. Here, we provide the full picture of quantum correlations in top quarks by studying also quantum discord and steering. We find that both phenomena are present at the LHC. In particular, quantum discord in a separable quantum state is expected to be detected with high-statistical significance. Interestingly, due to the singular nature of the measurement process, quantum discord can be measured following its original definition, and the steering ellipsoid can be experimentally reconstructed, both highly demanding measurements in conventional setups. In contrast to entanglement, the asymmetric nature of quantum discord and steering can provide witnesses of $CP$-violating physics beyond the standard model.

中文翻译：

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大型强子对撞机顶夸克的量子不和谐和转向

最近，顶夸克被证明是一种有前途的系统，可以在可用的最高能量尺度上研究量子信息。当前的研究方向主要讨论诸如纠缠、贝尔非局域性或量子断层扫描等主题。在这里，我们通过研究量子不和谐和转向，提供了顶夸克中量子相关性的全貌。我们发现这两种现象都存在于大型强子对撞机中。特别是，可分离量子态中的量子不和谐预计将被检测到具有高统计意义。有趣的是，由于测量过程的奇异性，量子不和谐可以按照其原始定义进行测量，并且可以通过实验重建转向椭球体，这在传统设置中都是要求很高的测量。与纠缠相比，$C磷$- 违反物理原理，超出标准模型。