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On symmetry-resolved generalized entropies

T0 review · 1 major / 4 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read This paper derives explicit sum formulas for the normalized generalized charged moments of the free compact boson CFT, making symmetry-resolved entanglement computable for arbitrary descendant states and matching XX-chain lattice data.

desk verdict A real technical advance on symmetry-resolved entanglement for descendant states, with a load-bearing boundary-condition approximation that needs scrutiny before the 1/log expansions are trusted. read the letter →

arxiv 2412.14165 v2 pith:2K3KS2D6 submitted 2024-12-18 quant-ph cond-mat.stat-mechcond-mat.str-elhep-th

classification quant-phcond-mat.stat-mechcond-mat.str-elhep-th MSC 81T40
keywords symmetry-resolvedentanglementgeneralizedRényientropieschargedmomentsfreecompactbosonCFTXXspinchainfullcountingstatisticsconformalfieldtheoryequipartition
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper introduces symmetry-resolved generalized Rényi entropies, which split the entanglement between a subsystem and its complement according to the sector of a global $U(1)$ charge while allowing the replica in- and out-states to be arbitrary excited states. These quantities are the building blocks for studying symmetry-resolved entanglement in excited states and in symmetry-preserving out-of-equilibrium dynamics. The paper claims that in the free massless compact boson CFT these entropies are controlled by normalized generalized charged moments, and it derives explicit sum formulas for the $n=1$ and $n=2$ moments, Eqs. (58) and (81), valid for arbitrary descendant states. At leading order in the chord length the moments are finite polynomials in the Aharonov–Bohm flux $\theta$, and the formulas reproduce known primary-state results and match exact XX-chain lattice computations. This gives a route to the full counting statistics of the subsystem charge and to the time evolution of symmetry-resolved entanglement after symmetric quenches.

What carries the argument

The central object is the normalized generalized charged moment $F_n(\theta;\psi_1,\ldots,\psi_{2n})$, defined in Eq. (19) as the ratio of the trace of $n$ glued generalized density matrices with an insertion of the subsystem charge operator $e^{i\theta Q_A}$ to the ground-state $n$-th charged moment. The computation uses the replica trick: the moment is a partition function on an $n$-fold branched cover of the cylinder, with vertex operators and $\partial\varphi$ insertions at the infinities and the $U(1)$ twist operators at the entanglement cuts. A conformal transformation, Eq. (40) for $n=1$ and Eq. (71) for $n=2$, maps this geometry to a branched cover of the plane, and the correlation-function ratio is expanded into Wick contractions. The sum formulas (58) and (81) organize these contractions into a polynomial in $\theta$: the $n=1$ case simplifies because contractions of $\partial\varphi$ with vertex operators combine into a phase $e^{i\beta\theta r\alpha}$ times mode-dependent factors $L(k_i)$, while the $n=2$ case requires the full functions $L_{k_j}(\theta)$ and $\tilde{L}_{k_j}(\bar{\alpha})$.

What would settle it

Evaluate the full cut-plane correlator in Eq. (47), including the boundary conditions on the two disks, and compare it with the plane-correlator approximation used in the paper: if the difference is not suppressed by at least one power of $1/\log(\ell/\epsilon)$ at the orders retained, the sum formulas for $F_n$ and the derived variance shift would be incomplete. On the lattice side, exact diagonalization of the XX chain at larger flux $\theta$ or for $n=2$ with additional descendant states would expose any missing $\theta$-dependence in the polynomial.

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Extended reading notes

Core claim

For a $(1+1)$-dimensional free massless compact boson with a $U(1)$ winding symmetry, the normalized generalized charged moment $F_n(\theta;\psi_1,\ldots,\psi_{2n})$ — the ratio of a charged replica trace built from $2n$ states to the ground-state charged moment — can be evaluated as an explicit sum over Wick contractions. The central formulas are Eq. (58) for $n=1$ and Eq. (81) for $n=2$: they give $F_n$ for arbitrary descendant states as a finite polynomial in $\theta$ at leading order in the chord length $\ell$, with coefficients that are trigonometric functions of the subsystem size ratio $r$. The $n=1$ formula is organized recursively by a pairing function $R$ and single-mode functions $L(k_i)$, while the $n=2$ formula additionally tracks contractions with the vertex-operator insertions through functions $L_{k_j}(\theta)$ and $\tilde{L}_{k_j}(\bar{\alpha})$. These sums reproduce the known primary-field charged moments from Refs. [18,20] and match exact lattice data in the XX chain for level-2 chiral states in Figures 4 and 5.

Load-bearing premise

The load-bearing premise is that correlation functions on the cut plane can be replaced by ordinary plane correlators, with the entanglement-cut boundary conditions contributing only corrections suppressed by powers of $\log(\ell/\epsilon)$; if that suppression fails at the orders the paper keeps, the polynomial-in-$\theta$ formulas, the $1/\log$ expansions, and the variance shift would be incomplete.

Editorial extensions

If this is right

  • For any descendant state of the compact boson CFT, the $n=1$ and $n=2$ symmetry-resolved generalized Rényi entropies can be written down directly from the sum formulas, extending previous results that were limited to primary states.
  • The $n=1$ moment is a generating function, so the full counting statistics of the subsystem $U(1)$ charge in an excited state follows immediately, with a mean shifted to $r m$ and a variance shifted by $-2\pi^2 h_2$ relative to the ground state.
  • Entanglement equipartition across charge sectors is broken at order $1/(\log \ell')^2$ by universal terms, and the excited-state symmetry-resolved second Rényi entropy acquires a double-logarithmic correction.
  • The same building blocks combine with a numerical time-evolution scheme to track symmetry-resolved entanglement and charge statistics after quantum quenches that preserve the symmetry.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the same Wick-contraction framework carries over to other CFTs, the natural next test is the Ising model's $\mathbb{Z}_2$ symmetry resolution for descendant states, whose analogous sums should produce polynomial charged moments with different trigonometric coefficients.
  • The predicted variance shift in the subsystem charge distribution is a sharp experimental signature: a quantum-gas microscope measuring charge fluctuations in a one-dimensional Bose gas after exciting a Luttinger-liquid state should see the distribution width deviate from the ground-state Gaussian.
  • The $r=1/2$ simplification in Appendix A.2 suggests that half-system bipartitions may admit closed forms for general $n$, which would provide a cheap diagnostic of the entire construction before more general geometries are attempted.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

1 major / 4 minor

Summary. The manuscript introduces the notion of symmetry-resolved generalized entropies, which are intended as building blocks for studying symmetry-resolved entanglement of excited states and its out-of-equilibrium dynamics. The central technical object is the normalized generalized charged moment F_n(θ; ψ_1, ..., ψ_{2n}) of Eq. (4). For the free compact boson CFT, the authors derive explicit sum formulas for the n=1 and n=2 chiral moments, Eq. (58) and Eq. (81), which at leading order in the chord length ℓ take the form of finite polynomials in the flux θ. These formulas are benchmarked against exact XX-chain lattice computations (Figs. 4 and 5) and against previously known primary-field results (Eqs. (64), (85), (86), (88)). The paper then applies the moments to compute the generalized subsystem charge distribution and the symmetry-resolved generalized second Rényi entropy, obtaining expansions in 1/log(ℓ/ε).

Significance. If the results hold, the paper provides a substantial extension of symmetry-resolved entanglement techniques from primary states to arbitrary descendant states in a CFT, which is directly relevant to Luttinger-liquid physics and to the program of computing entanglement dynamics via generalized entropies. The explicit Wick-contraction sums in Eqs. (58) and (81) are new, and their validation against exact lattice data and against independent published special cases is a genuine strength. The definition of symmetry-resolved generalized entropies is natural and likely to be reused. However, the practical value for out-of-equilibrium settings rests on the 1/log(ℓ/ε) expansions in Sections 6 and 7, and those expansions are the part of the paper that is least supported by derivation or numerics.

major comments (1)
  1. [Sec. 4.1 (below Eq. (47)); Sec. 5.1 (below Eq. (72))] The replacement of correlation functions on C′ (the plane with two disks cut out around 0 and ∞, representing the regularized entanglement cuts) by ordinary plane correlators is asserted with the statement that the effects of the entanglement-cut boundary conditions are 'suppressed by powers of log(ℓ/ε)', but no derivation or quantitative estimate is provided. In the free compact boson, the annulus has a compact zero mode whose contributions to correlators of vertex operators with zero total charge are of order 1/log(ℓ/ε), not exponentially small. Since the twist operators V_{±βθ/(2π)} are inserted at y0 ≈ δ and y0′ ≈ 1/δ, i.e., on the cut boundaries, their OPEs with the bulk insertions are exactly where boundary-condition dependence can enter. A correction of order 1/log(ℓ/ε) carrying an O(θ^2) piece would change h2 in Eq. (92), the variance shift b1 in Eq. (96), and the 1/log expansions in Eqs. (93), (99), (102), and (104), all of which are presented as physical results of the framework. The lattice benchmarks in Figs. 4 and 5 (L=64) test only selected level-2 descendants at two values of θ and cannot isolate a 1/log boundary term from lattice finite-size and parity effects. The authors should either provide an explicit boundary CFT computation showing that the boundary corrections are subleading at the orders kept, or include the 1/log corrections and re-derive the expansions in Sections 6 and 7.
minor comments (4)
  1. [Abstract] The abstract contains formatting artifacts from the LaTeX source ('W e', 'T he', and stray spaces), which should be cleaned before final submission.
  2. [Sec. 3.1, bullet 3] The phrase 'the regularization-dependent corrections are power-law suppressed by log ℓ/ε' is ambiguous; it should read 'suppressed by powers of 1/log(ℓ/ε)'.
  3. [Eq. (58) and similar formulas] The deletion notation R_{k1,...,\emptyset ki,...,kM} is not defined; please describe the deletion operation explicitly, for example by placing a hat over the deleted entry.
  4. [Figs. 4 and 5] The insets showing imaginary parts are small and hard to read; consider enlarging them or presenting the imaginary parts in separate panels.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: central sum formulas are derived by Wick contraction and benchmarked against exact lattice data and independent special cases.

full rationale

The derivation chain is self-contained and non-circular. The central objects F_L^1 and F_L^2 are obtained by explicit free-boson Wick contractions after the conformal maps in Eqs. (44) and (71); Eqs. (50), (58), (74), and (81) are concrete combinatorial sums, not definitions of the answer. The only load-bearing approximation is the replacement of C′ correlators by plane correlators below Eq. (47), with the suppression of entanglement-cut effects asserted rather than proved; this is a correctness and omitted-proof risk, but it is an input assumption, not a fitted or renamed output. The results are benchmarked against exact XX-chain lattice computations in Figs. 4 and 5 and reduce to the independently published special cases of Refs. [18,20] in Eqs. (64), (85), (86), and (88). Self-citations to Refs. [25] and [63] supply the ground-state charged-moment denominator and a ∂ϕ∂ϕ contraction simplification; neither carries the central derivation, and neither is the quantity being predicted. No parameter is fitted to the data used for comparison. Hence no circular step is exhibited, and the appropriate score is 0.

Assumptions & free parameters 0 free parameters · 5 assumptions · 0 invented entities

No parameters are fitted to data. The compactification radius β is a theory input (set to 1 for the XX-chain comparison), r and ℓ are geometric variables, and the regulator ε appears only in logarithms; the coefficients h2, f2, etc., in the expansions are outputs of the derivations. No new particles, fields, or conserved quantities are introduced.

assumptions (5)
  • domain assumption The effects of the entanglement-cut boundary conditions on the correlator ratios are suppressed by powers of log(ℓ/ε), so the cut-plane correlators in C′ can be replaced by complex-plane correlators at leading order.
    Stated in Section 4.1 below Eq. (47); underlies the polynomial-in-θ form of Fn and all 1/log expansions. If the suppression is not strong enough, the derived formulas are incomplete.
  • domain assumption At leading order in the chord length the normalized generalized charged moment Fn is a finite polynomial in θ, with subleading corrections suppressed by 1/log(ℓ/ε).
    Used in Sections 3.1, 6 and 7 to truncate the θ-series at o(θ^4) and to Fourier transform term by term; the decay of coefficients is argued, not proven.
  • standard math Wick's theorem applies to the free boson correlators on the replica surface, and the oscillator-mode integrals reduce to contour integrals around the insertion points, with the two-point functions given by Eq. (48).
    Standard CFT free-field technique; the basis for the sum formulas in Sections 4-5 and the appendices.
  • domain assumption The subsystem-restricted U(1)_w charge operator e^{iθQ_A} is realized by inserting vertex operators at the entangling points, requiring Dirichlet boundary conditions on the compact boson at the entangling surface.
    Used in Eq. (34) and throughout; standard in the symmetry-resolution literature but specific to the U(1)_w resolution.
  • domain assumption The XX spin chain with free-fermion techniques gives a lattice realization of the compact boson CFT at β=1, with the low-energy excited states mapped as in Appendix C.
    Underlies the numerical benchmarks in Figures 4 and 5; the mapping is taken from Refs. [10,67].

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Pith. "Pith review of On symmetry-resolved generalized entropies." pith.science (2026). https://pith.science/paper/2K3KS2D6

@misc{pith2026241214165,
  author       = {Pith},
  title        = {Pith review of: On symmetry-resolved generalized entropies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/2K3KS2D6}},
  note         = {Machine review of arXiv:2412.14165}
}
read the original abstract

Symmetry-resolved entanglement, capturing the refined structure of quantum entanglement in systems with global symmetries, has attracted a lot of attention recently. In this manuscript, introducing the notion of symmetry-resolved generalized entropies, we aim to develop a computational framework suitable for the study of excited state symmetry-resolved entanglement as well as the dynamical evolution of symmetry-resolved entanglement in symmetry-preserving out-of-equilibrium settings. We illustrate our framework using the example of (1+1)-d free massless compact boson theory, and benchmark our results using lattice computation in the XX chain. As a byproduct, our computational framework also provides access to the probability distribution of the symmetry charge contained within a subsystem and the corresponding full counting statistics.

Figures

Figures reproduced from arXiv: 2412.14165 by the authors.

Figure 1
Figure 1. Left: The replica geometry Cn for the computation of the generalized charged moment, as a n-fold branched covering of a cylinder with infinite length. The n sheets are glued together by identifying the edges of cut-open slits with the same color, e.g. the maroon-colored slit edge on sheet 1 is identified with the maroon-colored slit edge on sheet 2 etc. The operator O2i−1 corresponding to |ψ2i−1⟩ are inserted at the… view at source ↗
Figure 2
Figure 2. Left: The replica geometry Cn for computing the chiral normalized charged moment, as a n-fold branched covering of a cylinder with infinite length. The n sheets are glued together by identifying the edges of cut-open slits with the same color, e.g. the maroon-colored slit edge on sheet 1 is identified with the maroon-colored slit edge on sheet 2 etc. The vertex operators Vσiαi and ∂ϕ are inserted at the past and fut… view at source ↗
Figure 3
Figure 3. Left: The cylindrical geometry C1 for computing the chiral n = 1 normalized generalized charged moment, together with locations of various field insertions. Right: After the conformal transformation in Eq. (44), the cylindrical geometry C1 is mapped to the complex place with two disks cut out around 0 and ∞, which we denote as C ′ . To evaluate the chiral normalized n = 1 generalized charged moment, we perform a con… view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Benchmark of the CFT results for the generalized charged moments in [PITH_FULL_IMAGE:figures/full_fig_p022_4.png]
Figure 5
Figure 5. Figure 5: The top (bottom) panels are a test of the real (imaginary) part of the [PITH_FULL_IMAGE:figures/full_fig_p026_5.png]

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