标题： 测量一个“概率” $> 1$ 显示英文标题

标题： Measuring a "Probability" $> 1$

摘要： 基于历史的正式理论称为量子测度理论（QMT），它推广了概率测度的概念，以包含量子干涉。 由于干涉可能导致比组成部分强度简单相加更大的强度，因此\textit{量子测量}可能超过1，以特别明显的方式表现出其非经典性质。 在这里，我们研究了在QMT背景下的双位点跳跃器；并在一个光学实验中，使用基于辅助系统的事件过滤方案确定了一个特定跳跃器事件的测度。 对于这个测度，我们报告了一个值为$1.172$，它比经典概率允许的最大值（即$1$）高出$13.3$个标准差。 如果一种非常规的理论概念要参与解决量子理论的基础挑战，那么尽可能将其与实验联系起来似乎很重要。 我们的实验为此提供了量子测度的接触。 显示英文摘要

摘要： The history based formalism known as Quantum Measure Theory (QMT) generalizes the concept of probability-measure so as to incorporate quantum interference. Because interference can result in a greater intensity than the simple sum of the component intensities, the \textit{quantum measure} can exceed unity, exhibiting its non-classical nature in a particularly striking manner. Here we study the two-site hopper within the context of QMT; and in an optical experiment, we determine the measure of a specific hopper event, using an ancilla based event filtering scheme. For this measure we report a value of $1.172$, which exceeds the maximum value permissible for a classical probability (namely $1$) by $13.3$ standard deviations. If an unconventional theoretical concept is to play a role in meeting the foundational challenges of quantum theory, then it seems important to bring it into contact with experiment as much as possible. Our experiment does this for the quantum measure.