Matrix Thermodynamic Uncertainty Relation for Non-Abelian Charge Transport

• URL: http://arxiv.org/abs/2512.24956v1
• Date: Wed, 31 Dec 2025 16:38:45 GMT
• Title: Matrix Thermodynamic Uncertainty Relation for Non-Abelian Charge Transport
• Abstract summary: We derive a process-level matrix TUR starting from the operational entropy production.<n>We prove a fully nonlinear, saturable lower bound valid for arbitrary current vectors.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Thermodynamic uncertainty relations (TURs) bound the precision of currents by entropy production, but quantum transport of noncommuting (non-Abelian) charges challenges standard formulations because different charge components cannot be monitored within a single classical frame. We derive a process-level matrix TUR starting from the operational entropy production $Σ= D(ρ'_{SE}\|ρ'_S\!\otimes\!ρ_E)$. Isolating the experimentally accessible bath divergence $D_{\mathrm{bath}}=D(ρ'_E\|ρ_E)$, we prove a fully nonlinear, saturable lower bound valid for arbitrary current vectors $Δq$: $D_{\mathrm{bath}} \ge B(Δq,V,V')$, where the bound depends only on the transported-charge signal $Δq$ and the pre/post collision covariance matrices $V$ and $V'$. In the small-fluctuation regime $D_{\mathrm{bath}}\geq\frac12\,Δq^{\mathsf T}V^{-1}Δq+O(\|Δq\|^4)$, while beyond linear response it remains accurate. Numerical strong-coupling qubit collisions illustrate the bound and demonstrate near-saturation across broad parameter ranges using only local measurements on the bath probe.

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