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arxiv: 2508.05494 · v1 · submitted 2025-08-07 · ❄️ cond-mat.str-el · hep-th

Symmetry Resolved Entanglement Entropy in a Non-Abelian Fractional Quantum Hall State

Pith reviewed 2026-05-19 00:14 UTC · model grok-4.3

classification ❄️ cond-mat.str-el hep-th
keywords symmetry-resolved entanglement entropyMoore-Read statenon-Abelian fractional quantum Hallentanglement spectrummatrix product statesLi-Haldane conjecturetopological order
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The pith

Symmetry-resolved entanglement entropy shows approximate equipartition in the non-Abelian Moore-Read quantum Hall state even with distinct mode velocities.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper applies matrix product state techniques to compute both the full counting statistics and the symmetry-resolved entanglement entropies for the bosonic Moore-Read state. It finds that entanglement is shared approximately equally among symmetry sectors, in line with theoretical expectations, and that this holds when the Abelian charge symmetry cannot label the topological sectors and when neutral and charged modes travel at different speeds. A sympathetic reader would care because the result tests whether the symmetry-resolution framework remains reliable for genuinely non-Abelian topological order under realistic dynamical conditions.

Core claim

Numerical results for the Moore-Read state reveal an approximate equipartition of entanglement among symmetry sectors that remains valid even though the topological sectors cannot be distinguished by the Abelian U(1) symmetry alone and even though neutral and charged modes possess distinct velocities. Finite-size corrections are present but consistent with expectations, and the entanglement spectrum agrees closely with the Li-Haldane conjecture across sectors.

What carries the argument

Symmetry-resolved entanglement entropy, which partitions the total entanglement according to symmetry sectors, evaluated numerically in the Moore-Read state.

If this is right

  • Equipartition of entanglement among sectors survives in non-Abelian states where U(1) charge does not separate topological sectors.
  • Differences in neutral and charged mode velocities produce only finite-size corrections that do not destroy the overall equipartition.
  • The Li-Haldane conjecture accounts for the observed structure and sector dependence of finite-size effects in the entanglement spectrum.
  • Full counting statistics remain accessible and consistent with the same symmetry resolution.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same numerical route could be applied to other non-Abelian states such as Read-Rezayi to test whether equipartition is a general feature.
  • Accounting explicitly for velocity mismatch may improve how finite-size data are used to extract topological entanglement properties.
  • If the pattern holds, symmetry resolution could become a practical diagnostic for identifying non-Abelian order in future experiments.

Load-bearing premise

The numerical representations and system sizes used are accurate enough to capture the non-Abelian order and the different speeds of the modes without misleading errors from limited scale or approximations.

What would settle it

A calculation on significantly larger systems that finds the symmetry-resolved entanglement entropies differing by amounts that grow rather than shrink with size would show the equipartition does not hold.

Figures

Figures reproduced from arXiv: 2508.05494 by Benoit Estienne, Mark J. Arildsen, Nicolas Regnault, Valentin Cr\'epel.

Figure 1
Figure 1. Figure 1: FIG. 1. The geometry that we consider is an infinite cylinder [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 7
Figure 7. Figure 7: We can understand this from the fact that the [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. The subtracted symmetry-resolved second R´enyi entanglement entropy [PITH_FULL_IMAGE:figures/full_fig_p010_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. A plot of the [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The FCS for the bosonic Moore-Read state at Φ = 0 (open markers), Φ = [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. The parity imbalance ( [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. The parity imbalance ( [PITH_FULL_IMAGE:figures/full_fig_p011_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Von Neumann TEE in each of the vacuum [PITH_FULL_IMAGE:figures/full_fig_p012_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. The parity imbalance ( [PITH_FULL_IMAGE:figures/full_fig_p012_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. A comparison of the exact integer quantum Hall effect [PITH_FULL_IMAGE:figures/full_fig_p019_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. Von Neumann TEE in the vacuum [PITH_FULL_IMAGE:figures/full_fig_p020_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Comparison of the von Neumann topological entanglement entropy of the bosonic Moore-Read state in the vacuum [PITH_FULL_IMAGE:figures/full_fig_p021_11.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13. The bosonic velocities [PITH_FULL_IMAGE:figures/full_fig_p021_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14. The fermionic velocities [PITH_FULL_IMAGE:figures/full_fig_p022_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: FIG. 15. The second, fourth and sixth cumulants [PITH_FULL_IMAGE:figures/full_fig_p023_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16. A comparison of the lower levels of the bosonic [PITH_FULL_IMAGE:figures/full_fig_p023_16.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18. The subtracted symmetry-resolved second R´enyi [PITH_FULL_IMAGE:figures/full_fig_p024_18.png] view at source ↗
Figure 20
Figure 20. Figure 20: FIG. 20. The FCS for the bosonic Moore-Read state plotted as a function [PITH_FULL_IMAGE:figures/full_fig_p025_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: FIG. 21. The second cumulant (variance) [PITH_FULL_IMAGE:figures/full_fig_p025_21.png] view at source ↗
read the original abstract

Symmetry-resolved entanglement entropy provides a powerful framework for probing the internal structure of quantum many-body states by decomposing entanglement into contributions from distinct symmetry sectors. In this work, we apply matrix product state techniques to study the bosonic, non-Abelian Moore-Read quantum Hall state, enabling precise numerical evaluation of both the full counting statistics and symmetry-resolved entanglement entropies. Our results reveal an approximate equipartition of entanglement among symmetry sectors, consistent with theoretical expectations and subject to finite-size corrections. The results also show that these expectations for symmetry-resolved entanglement entropy remain valid in the case of a non-Abelian state where the topological sectors cannot be distinguished by the Abelian $\mathrm{U}(1)$ symmetry alone, and where neutral and charged modes possess distinct velocities. We additionally perform a detailed comparison of the entanglement spectrum with predictions from the Li-Haldane conjecture, finding remarkable agreement, and enabling a more precise understanding of the effects of the distinct neutral and charged velocities. This not only provides a stringent test of the conjecture but also highlights its explanatory power in understanding the origin and structure of finite-size effects across different symmetry sectors.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper numerically studies symmetry-resolved entanglement entropy (EE) in the bosonic Moore-Read non-Abelian fractional quantum Hall state using matrix product states (MPS). It reports an approximate equipartition of EE among symmetry sectors that is consistent with theoretical expectations, even though U(1) charge symmetry alone cannot distinguish topological sectors and neutral/charged modes have distinct velocities. The work also compares the entanglement spectrum to Li-Haldane conjecture predictions, finding good agreement that helps explain finite-size corrections across sectors.

Significance. If the MPS results are sufficiently converged, the manuscript provides a valuable extension of symmetry-resolved EE analysis to non-Abelian states, confirming that equipartition expectations hold beyond Abelian cases and offering a concrete test of the Li-Haldane conjecture for velocity-induced finite-size effects. The numerical approach for a non-Abelian state with mode-dependent velocities is a technical strength.

major comments (2)
  1. [Numerical Methods] Numerical Methods (assumed §3 or equivalent): The manuscript does not report the MPS bond dimension employed or any explicit bond-dimension scaling analysis. For the Moore-Read state, capturing Ising anyon fusion rules and neutral-sector degeneracy typically demands higher bond dimensions than Abelian Laughlin states; without this check, truncation artifacts could artificially enforce the reported equipartition.
  2. [Results] Results on finite-size corrections (assumed §4 or equivalent): While finite-size corrections and Li-Haldane agreement are noted in the abstract, the text does not demonstrate that corrections remain uniform across sectors when neutral and charged velocities differ. If cylinder circumference or system size is insufficient, mode-dependent correlation lengths can produce spurious equipartition that vanishes at larger sizes.
minor comments (2)
  1. [Abstract] The abstract states 'remarkable agreement' with Li-Haldane; a quantitative metric (e.g., overlap or deviation per sector) should be added in the main text or a table.
  2. [Introduction] Notation for symmetry sectors and anyonic labels should be defined explicitly on first use to aid readers unfamiliar with non-Abelian FQH conventions.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the constructive comments, which help improve the clarity and rigor of our numerical analysis. We address each major comment point by point below.

read point-by-point responses
  1. Referee: [Numerical Methods] Numerical Methods (assumed §3 or equivalent): The manuscript does not report the MPS bond dimension employed or any explicit bond-dimension scaling analysis. For the Moore-Read state, capturing Ising anyon fusion rules and neutral-sector degeneracy typically demands higher bond dimensions than Abelian Laughlin states; without this check, truncation artifacts could artificially enforce the reported equipartition.

    Authors: We agree that explicit reporting of the bond dimension and a convergence check are important for establishing the reliability of the results, particularly for a non-Abelian state. The calculations were performed with bond dimensions sufficient to resolve the low-lying entanglement spectrum and the relevant anyonic sectors, but we acknowledge that these details and a scaling discussion were omitted from the text. In the revised manuscript we will add the maximum bond dimension used, along with a short paragraph or supplementary note demonstrating that the equipartition and entanglement spectrum remain stable upon increasing the bond dimension within the range accessible to our simulations. revision: yes

  2. Referee: [Results] Results on finite-size corrections (assumed §4 or equivalent): While finite-size corrections and Li-Haldane agreement are noted in the abstract, the text does not demonstrate that corrections remain uniform across sectors when neutral and charged velocities differ. If cylinder circumference or system size is insufficient, mode-dependent correlation lengths can produce spurious equipartition that vanishes at larger sizes.

    Authors: We thank the referee for emphasizing the need to explicitly connect the velocity mismatch to the observed corrections. Our comparison to the Li-Haldane conjecture already incorporates the distinct neutral and charged velocities and shows consistent agreement across symmetry sectors, which accounts for the finite-size effects rather than indicating an artifact. Nevertheless, to strengthen the presentation we will revise the results section to include a more direct illustration—such as a plot or tabulated comparison—of how the sector-dependent corrections follow the velocity-induced pattern predicted by the conjecture, thereby demonstrating their uniformity in the sense relevant to the equipartition statement. revision: yes

Circularity Check

0 steps flagged

No significant circularity: numerical verification of symmetry-resolved EE expectations

full rationale

The paper performs direct MPS numerical computations of symmetry-resolved entanglement entropy and full counting statistics on the bosonic Moore-Read state. Results are reported as approximately consistent with prior theoretical expectations for equipartition, with explicit acknowledgment of finite-size corrections and comparison to the external Li-Haldane conjecture. No load-bearing step reduces a claimed prediction or first-principles result to a fitted parameter, self-definition, or self-citation chain by construction; the central claim is an independent numerical test rather than a tautological renaming or ansatz smuggling. The study is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review yields no explicit free parameters, axioms, or invented entities; the work relies on standard MPS techniques and prior theoretical expectations for symmetry-resolved entanglement.

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