Symmetry resolved relative entropies and distances in conformal field theory
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Publication:825812
DOI10.1007/JHEP10(2021)195zbMATH Open1476.81110arXiv2105.08596OpenAlexW3208452376MaRDI QIDQ825812
Author name not available (Why is that?)
Publication date: 17 December 2021
Published in: (Search for Journal in Brave)
Abstract: We develop a systematic approach to compute the subsystem trace distances and relative entropies for subsystem reduced density matrices associated to excited states in different symmetry sectors of a 1+1 dimensional conformal field theory having an internal U(1) symmetry. We provide analytic expressions for the charged moments corresponding to the resolution of both relative entropies and distances for general integer . For the relative entropies, these formulas are manageable and the analytic continuation to can be worked out in most of the cases. Conversely, for the distances the corresponding charged moments become soon untreatable as increases. A remarkable result is that relative entropies and distances are the same for all symmetry sectors, i.e. they satisfy entanglement equipartition, like the entropies. Moreover, we exploit the OPE expansion of composite twist fields, to provide very general results when the subsystem is much smaller than the total system. We focus on the massless compact boson and our results are tested against exact numerical calculations in the XX spin chain.
Full work available at URL: https://arxiv.org/abs/2105.08596
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