Title: Decoherence in high energy collisions as renormalization group flow Show Chinese title

Title: 高能碰撞中的退相干作为重整化群流

Abstract: The unification of quantum information science and collider physics is opening a new frontier in high-energy experiments, making a systematic understanding of decoherence a critical challenge. We present a framework to systematically compute spin decoherence from final-state radiation by combining soft-collinear effective theory and open quantum system techniques. We demonstrate that the renormalization group (RG) evolution of the final-state spin density matrix constitutes a quantum channel, where the RG flow parameter, rather than time, drives a Markovian loss of quantum information. Our approach incorporates explicit detector resolution parameters, allowing a direct connection between experimental capabilities and the preservation of quantum coherence. Applying this formalism to a fermion pair ($f\bar{f}$) in the high-energy limit with QED-like final-state radiation, we provide the first systematically RG-improved prediction for decoherence as a function of experimental resolution, revealing the underlying decoherence mechanism to be a phase-flip channel. This work establishes an essential theoretical tool for future precision measurements of quantum phenomena in high-energy collisions and offers a new perspective on the interplay between RG flow and decoherence of open quantum systems. Show Chinese abstract

Abstract: 量子信息科学与对撞机物理的统一正在开启高能实验的新前沿，使得对退相干的系统理解成为一项关键挑战。 我们提出一个框架，通过结合软-胶子有效理论和开放量子系统技术，系统地计算末态辐射引起的自旋退相干。 我们证明，末态自旋密度矩阵的重整化群（RG）演化构成一个量子信道，其中RG流参数而非时间驱动量子信息的马尔可夫性损失。 我们的方法包含明确的探测器分辨率参数，使实验能力与量子相干性的保持之间能够直接连接。 将此形式化方法应用于高能极限下的费米子对（$f\bar{f}$）以及类似QED的末态辐射，我们首次提供了关于实验分辨率的退相干系统RG改进预测，揭示出基本的退相干机制为相位翻转信道。 这项工作为未来高能碰撞中量子现象的精密测量建立了一个重要的理论工具，并为RG流与开放量子系统退相干之间的相互作用提供了一个新的视角。