Decoherence in high energy collisions as renormalization group flow

• URL: http://arxiv.org/abs/2510.13951v1
• Date: Wed, 15 Oct 2025 18:00:01 GMT
• Title: Decoherence in high energy collisions as renormalization group flow
• Authors: Jiayin Gu, Shi-Jia Lin, Ding Yu Shao, Lian-Tao Wang, Si-Xiang Yang,
• Abstract summary: We present a framework to compute spin decoherence from final-state radiation by combining soft-collinear effective theory and open quantum system techniques.<n>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.
• Score: 0.4077787659104315
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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