标题： 顶夸克量子相干性的非局域优势 显示英文标题

标题： Nonlocal Advantage of Quantum Coherence in Top Quarks

摘要： 在使用量子信息理论工具研究顶夸克系统方面，兴趣日益增长。顶夸克的一个关键特点是它在强子化或自旋去相关发生之前就衰变，从而保留了它的自旋信息。这一独特性质使得可以直接访问自旋关联，使顶夸克成为探测高能物理过程中基本量子关联的理想候选者。在这一背景下，已经研究了一系列来自量子信息理论的概念，如纠缠、贝尔非定域性、量子引导、量子失谐和保真度。这些测量中的几种已被用作诊断工具，以测试标准模型，并寻找超越标准模型的可能迹象。然而，在这一背景下， $\textit{nonlocal advantage of quantum coherence}$ （自然阿达马量子相干性）尚未得到广泛探索。在这项工作中，我们详细研究了顶夸克对产生过程中的自然阿达马量子相干性。我们采用了基于 $l_{1}$-范数和相干性的相对熵的两种互补的自然阿达马量子相干性测量方法。我们还研究了角度平均对此类测量的影响。我们的发现揭示了丰富的相干结构，并强调自然阿达马量子相干性可能是高能物理系统中一种潜在的新颖且互补的量子签名。 显示英文摘要

摘要： There is a growing interest in investigating top-quark systems using tools from quantum information theory. A key peculiarity of the top quark is that it decays before hadronization or spin decorrelation occurs, thereby preserving its spin information. This unique property enables direct access to spin correlations, making the top quark an ideal candidate for probing fundamental quantum correlations in high-energy physics processes. A wide range of concepts from quantum information theory, such as entanglement, Bell nonlocality, quantum steering, quantum discord, and fidelity, have been investigated in this context. Several of these measures have been employed as diagnostic tools to test the Standard Model and to search for possible signatures of physics beyond. However, the $\textit{nonlocal advantage of quantum coherence}$ (NAQC) has remained largely unexplored in this context. In this work, we present a detailed investigation of the NAQC in top quark pair production. We employ two complementary NAQC measures based on the $l_{1}$-norm and the relative entropy of coherence. We also study the effect of angular averaging on these measures. Our findings reveal rich coherence structures and highlight NAQC as potentially a novel and complementary quantum signature in high-energy physics systems.