论文标题
在三级捕获的离子系统中，实验性违反了leggett-garg的不平等
Experimental violation of Leggett-Garg inequality in a three-level trapped-ion system
论文作者
论文摘要
Leggett-Garg不平等（LGI）研究物理系统演变的时间相关性。经典系统遵守LGI，但量子系统可能会违反它。违规的程度取决于量子系统的维度和状态更新规则。在这项工作中，我们在磁场中大型自旋进攻模型下实验测试了三级捕获离子系统中的LGI。冯·诺伊曼（Von Neumann）和吕德斯（LüdersState）的更新规则在我们的系统中采用直接比较分析。在Von Neumann州更新规则下，Legget-Garg相关器的最大观察值为$ K_3 = 1.739 \ pm 0.014 $，这表明违反了17个标准偏差的lüders，并且是迄今为止在自然三级系统中最重要的违规行为。
Leggett-Garg inequality (LGI) studies the temporal correlation in the evolution of physical systems. Classical systems obey the LGI but quantum systems may violate it. The extent of the violation depends on the dimension of the quantum system and the state update rule. In this work, we experimentally test the LGI in a three-level trapped-ion system under the model of a large spin precessing in a magnetic field. The Von Neumann and Lüders state update rules are employed in our system for direct comparative analysis. The maximum observed value of Leggett-Garg correlator under the Von Neumann state update rule is $K_3 = 1.739 \pm 0.014$, which demonstrates a violation of the Lüders bound by 17 standard deviations and is by far the most significant violation in natural three-level systems.
