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Conserved quantities enable the quantum Mpemba effect in weakly open systems

T0 review · 3 major / 4 minor · reviewed 2026-08-03 · deepseek-v4-flash

Pith's one-line read In weakly open systems, the quantum Mpemba effect requires the Hamiltonian to have additional conserved quantities or be integrable.

desk verdict The conserved-quantity-count criterion is an attractive contribution and the numerics are solid, but the 'only when' argument has a real gap: non-crossing of β(t) doesn't rule out crossing of distance curves. read the letter →

arxiv 2511.16739 v2 pith:NRHPEMTV submitted 2025-11-20 quant-ph cond-mat.stat-mech

classification quant-phcond-mat.stat-mech
keywords quantumMpembaeffectweakdissipationconservedquantitiesgeneralizedGibbsensembleintegrabilitychaoticdynamicsLindbladequationtensornetworks
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

The paper claims that in weakly open many-body systems starting from thermal states, the quantum Mpemba effect—where the initially farther state relaxes to the steady state faster than the closer one—occurs only when the Hamiltonian has other approximately conserved quantities in addition to energy, or is integrable. When energy is the only conserved quantity, dissipative dynamics confines the system to a one-parameter manifold of thermal states, so distance-to-steady-state trajectories from different initial temperatures cannot cross. With additional conserved quantities, the dynamics moves in a multi-dimensional generalized Gibbs ensemble (GGE) manifold, and projecting onto a scalar distance allows crossings. The paper supports this with tensor-network simulations for up to 160 sites and free-fermion calculations for up to 400 sites.

What carries the argument

The engine of the argument is the weak-dissipation decomposition ρ(t)=ρλ(t)+δρ(ε,t), where ρλ(t) is a (generalized) Gibbs ensemble with time-dependent Lagrange parameters λi(t) for each approximately conserved quantity C_i (Eq. 3), and Eq. (4) gives the slow evolution λ̇i(t) from the dissipator. With N_C=1 this reduces to a single equation for β(t); with N_C>1 it becomes a multidimensional flow. The crossing criterion is evaluated with the normalized Frobenius distance dℓ on a small subsystem (Eq. 5).

What would settle it

Compute or measure dℓ(t) for two thermal initial states at different temperatures in a chaotic Hamiltonian with no conserved quantity besides energy, scanning all Lindblad operators and subsystem sizes ℓ up to the thermodynamic limit. If the distance curves cross for N_C=1, the claimed dichotomy fails. Conversely, if the crossing time diverges with ℓ in an integrable model, the Mpemba effect may be an artifact of small-subsystem projections.

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Extended reading notes

Core claim

The central claim is that the number of approximately conserved quantities N_C of the Hamiltonian governs whether the quantum Mpemba effect appears in weakly dissipative dynamics from thermal initial states. For N_C=1, the zeroth-order density matrix is a time-dependent Gibbs state, and the inverse temperature β(t) flows monotonically, so two trajectories cannot swap their distance ordering to the steady state. For N_C>1, the zeroth-order state is a time-dependent generalized Gibbs ensemble with several Lagrange parameters; its projection onto a scalar distance can cross, enabling the Mpemba effect. The paper demonstrates this for a chaotic transverse-field Ising model (no Mpemba), an integr

Load-bearing premise

The central dichotomy rests on the assumption that the weakly dissipative dynamics is faithfully captured by the zeroth-order (G)GE manifold, and that the normalized Frobenius distance on a small subsystem (ℓ=2) reveals crossings that would also appear in trace distance and in the large-ℓ limit.

Editorial extensions

If this is right

  • If the criterion holds, experiments seeking the quantum Mpemba effect in weakly open systems should target integrable or nearly integrable materials, or systems with conserved charges such as magnetization, rather than generic chaotic Hamiltonians.
  • The N_C=2 example shows the effect can be tuned by the bath coupling strength; the Mpemba crossing may disappear for sufficiently strong dissipation, so weak coupling is a practical requirement.
  • The relation to orthogonality to the slowest decaying mode provides a microscopic handle: only when multiple conserved quantities exist can the farthest thermal state also be nearly orthogonal to the slowest mode.
  • The crossing time remains O(1) in subsystem size for the integrable case, suggesting the effect is robust for experimentally relevant small subsystems, even if its thermodynamic-limit fate is unclear.
  • The paper's conclusions give a concrete diagnostic: scan initial temperatures; if no distance crossing appears in a chaotic model with only energy conservation, the criterion predicts none will appear for any weak Lindblad dissipation.

Reading between the lines

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

  • A natural extension is that the criterion may survive even for coupling to thermal baths: approximate integrability might produce sufficiently nonthermal transient dynamics to generate the Mpemba effect, a scenario the paper lists as future work.
  • The no-crossing argument for N_C=1 is stated for β(t), not directly for dℓ(t); proving that no crossing of dℓ(t) occurs requires a monotonicity property of the distance functional along the Gibbs flow, which the paper asserts but does not prove.
  • The large-ℓ ambiguity (crossing time may not converge) suggests the Mpemba effect could be an artifact of small-subsystem projections; a testable extension is to compute t_Mp for ℓ scaling with system size in the free-fermion GGE.
  • The N_C=2 inverse Mpemba observation invites a systematic scan of the (β, μ) parameter plane to map the region of crossings, which could reveal how generic the effect is with a single additional conserved quantity.
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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

3 major / 4 minor

Summary. The paper studies weakly open many-body quantum systems initialized in thermal states and asks when the quantum Mpemba effect — the initially farther state relaxing faster to the steady state — occurs. The central claim is that, for weak bulk Lindblad dissipation, the Mpemba effect is possible only when the unitary Hamiltonian commutes with additional extensive operators (NC>1) or is integrable; when the energy is the only approximately conserved quantity (NC=1), the dynamics is confined to a one-parameter thermal manifold and the authors argue that distance curves cannot cross. The paper provides numerical support from tensor-network simulations for a chaotic Ising chain (NC=1), an integrable transverse-field Ising chain (NC~L), and a non-integrable Hamiltonian with an additional conserved S^z (NC=2), cross-checked against a generalized Gibbs ensemble (GGE) approximation.

Significance. If the central structural criterion were established, it would provide a useful necessary condition for the quantum Mpemba effect in weakly open many-body systems, tying the phenomenon to conservation laws. The paper's strengths are its large-scale tensor-network and free-fermion calculations, the explicit validation of the GGE approximation against finite-coupling TEBD, and the independent orthogonality-to-slowest-mode diagnostic in the End Matter. However, the necessity claim ('only when') is not proven; the dimensional-reduction argument addresses β(t) rather than the distance d_ℓ(t), and the numerical evidence covers a limited parameter range. The paper is significant as a candidate structural principle, but the current support is conditional.

major comments (3)
  1. [Results, paragraph starting 'As underlined in the equation of motion (4)' and Fig. 2(c)] The impossibility argument for NC=1 rests on non-crossing of β(t) trajectories. But the Mpemba condition is defined through d_ℓ(t)=d_ℓ(ρ_β(t),ρ_SS), Eq. (5). If β_SS lies between β_h(0) and β_c(0), then D(β)=d_ℓ(ρ_β,ρ_SS) has a minimum at β_SS; two trajectories approaching from opposite sides can have crossing D(t) curves whenever the relaxation rates on the two sides differ. A general 1D autonomous flow β̇=f(β) allows such asymmetry. The scan in Fig. 2(c) covers only β∈[0,0.2] for one chaotic model and does not test pairs straddling β_SS, nor does it establish monotonicity of D(β). Thus the universal 'only when' claim is not supported by the presented argument.
  2. [End Matter, Fig. 5(a)] The orthogonality analysis shows for one chaotic model (L≤16) that the thermal state orthogonal to the slowest mode is also the state closest to the steady state, ruling out Mpemba for that model. This coincidence may be model-dependent; it does not establish a general structural criterion. Since the main text claims 'possible only when NC>1 or integrable', a general argument or a systematic test across multiple chaotic NC=1 models is needed.
  3. [Equation (5) and End Matter distance comparisons] The central claim is established only for the normalized Frobenius distance on a small subsystem (ℓ=2). The End Matter compares trace, Frobenius, and normalized Frobenius distances only for the initial-state distance to the steady state (Fig. 5), not for the time-dependent curves. It therefore does not demonstrate that the presence/absence of a crossing is robust under the trace distance or for larger ℓ. Given the acknowledged debate on distance definitions, the claimed dichotomy may depend on the chosen measure.
minor comments (4)
  1. [Fig. 2(c) caption] The caption says 'different initial temperatures β∈[0,0.2]' but does not state the number of curves or their spacing. Please specify the scan resolution.
  2. [Text near Eq. (6)] The notation 'N_C ∼ 2^L' for the integrable case is imprecise; either 'N_C = 2^L' or a clarification of the order-of-magnitude meaning would help.
  3. [End Matter normalized overlap definition] The expression for the normalized overlap, '||ρ^{(r)}_{slow}||_1 * Tr[(ρ^{(l)}_{slow})^† ρ_β]', is hard to parse; a brief verbal description would improve readability.
  4. [Results, NC=2 model (Fig. 3)] The statement 'a finer tuning of the Lindblad operators appears to be required' is vague. Please quantify how the effect depends on the dissipator choice or the coupling strength.

Circularity Check

1 steps flagged · score 2.0 of 10

No definitional circularity — NC>1 predictions are computed and cross-checked by TEBD and ED orthogonality diagnostics; but the NC=1 impossibility argument equates non-crossing of β(t) with non-crossing of the Mpemba distance d_ℓ(t), leaving the load-bearing 'only when NC>1' step asserted rather than proved.

  1. other [Results, paragraph after Fig. 2 (Mpemba detection via Eq. (5)); Conclusions]
    "If the dynamics starting from two different thermal states were to intersect at a Gibbs ensemble with the same temperature, both would then follow the same temperature trajectory, β(t). This, however, does not occur: the evolution from different initial states is smooth and monotonic and the trajectories do not cross while relaxing toward the steady-state temperature (Fig. 2c). ... Calculating the distance between the time-dependent GGE and the steady state projects the evolution from a multi-dimensional space to a single dimension, possibly allowing for crossing between trajectories correspon"

    Mpemba is defined, Eq. (5), by crossing of scalar distances d_ℓ(ρ_β(t),ρ_SS)=D(β(t)); the quoted reasoning rules out crossing of β(t) itself. Non-crossing of β(t) does not imply non-crossing of D(β(t)): with initial β's on opposite sides of the steady-state temperature (as in Fig. 2(a), β=0 vs 0.15), both D(β_h(t)) and D(β_c(t)) decay to zero and can cross when relaxation from the two sides is asymmetric — the single-variable Markovian-Mpemba mechanism of Refs. [12,14]. No monotonicity condition is stated or proved, so the impossibility half ('possible only when...') is restated as the premise that crossings 'cannot appear' in a 1D thermal manifold, not derived. Weight limited: Fig. 2(c) numerically scans β∈[0,0.2] and the End-Matter orthogonality analysis is an independent diagnostic.

full rationale

Verdict: the paper is not circular in the definitional or data-fitting sense; its central positive content is genuinely computed. (i) The integrable-case Mpemba crossing is obtained from the free-fermion scattering equation, which the Supplementary Material derives in situ (Eqs. S5–S9), so the self-citation to Ref. [87] is not load-bearing; the weak-dissipation decomposition (Eq. 2, Ref. [78]) is a standard framework with independent support from other groups (Refs. [88–96]). (ii) Nothing is fitted and then called a prediction: crossing times and distances are direct evaluations of Eqs. (4)/(5); β_c=0.12 is motivated by the small-system slowest-mode orthogonality dip (End Matter, Fig. 7), but the integrable case exhibits crossings over a whole interval [0,0.15] (Fig. 6), not at a tuned point. (iii) Finite-ϵ TEBD results converge to the (G)GE prediction, and the orthogonality-to-slowest-mode analysis (projected Liouvillian ED, L≤16) corroborates the dichotomy independently. The flagged step is a logical gap, not a definitional equivalence: the NC=1 impossibility argument treats non-crossing of β(t) as excluding crossing of the distance curves d_ℓ(t)=D(β(t)), which single-variable Markovian Mpemba systems (Refs. [12,14]) show is generally false. The paper itself concedes scope limits — 'our dimensional-reduction argument applies at the level of the zeroth-order approximation'; 'it is difficult to conclude whether they converge to a finite value for a thermodynamically large ℓ'; 'there is some debate regarding which definition of distance should be used'; finer Lindblad tuning needed for NC=2 — and these belong to correctness/robustness risk, not circularity. Hence score 2.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The paper introduces no new entities. Its load-bearing inputs are the Gibbs/GGE reduction and the projected-Liouvillian/orthogonality criterion imported from prior work, plus hand-chosen initial states, dissipators, and subsystem sizes. The central 'only when' claim is not derived from these inputs alone; it requires additional unproved monotonicity/distance-invariance assumptions.

free parameters (4)
  • Initial cold inverse temperature β_c for NC=2 model = 0.12
    Chosen because the orthogonality analysis in End Matter shows near-zero overlap with slowest mode around β=0.12; the main-text Mpemba demonstration for Hamiltonian (7) uses β_c=0.12 and β_h=0. This is a hand-picked value, disclosed in End Matter.
  • Lindblad operators L_j for each model = L_j = S+_j S-_j+1 + S^z_j + 1/2 1_j (NC=1, NC~L); L_j = 1/2 S+_j (1-σ^z_{j+1}) + σ^x_j (NC=2)
    Chosen by hand; the paper states for NC=2 'a finer tuning of the Lindblad operators appears to be required', indicating the effect is not robust to this choice.
  • Dissipation strength ϵ for NC=2 effect = ϵ ≲ 0.2 (effect absent at ϵ=0.5)
    The Mpemba effect for the two-conserved-quantity chaotic model is only present for sufficiently small coupling; this regime is imposed, not derived.
  • Subsystem size ℓ = ℓ=2 in main-text figures
    The claimed Mpemba signature is measured on a small subsystem; crossing times and existence depend on ℓ, and convergence for large ℓ is not established.
assumptions (5)
  • domain assumption Weak-dissipation decomposition ρ(t)=ρ_λ(t)+δρ(ϵ,t) with ρ_λ of Gibbs/GGE form, Eq. (3).
    Taken from Ref. [78]; the paper relies on this zeroth-order description to reduce dynamics to one-dimensional (NC=1) or multi-dimensional (NC>1) manifolds. The central crossing argument lives at zeroth order.
  • domain assumption The slow dynamics of the dissipator is captured by the projected Liouvillian onto the diagonal (Hamiltonian-eigenstate) subspace, D_mn=<m|(D|n><n|)|m>.
    Used in End Matter for the orthogonality analysis; assumes the slowest mode lies in the diagonal subspace and that this captures Mpemba-relevant relaxation.
  • domain assumption Orthogonality of the initial state to the slowest decaying Liouvillian mode is the criterion for faster relaxation (Mpemba).
    Imported from Markovian Mpemba literature [48-62]; used to interpret the End Matter overlap calculations as explaining the main-text results.
  • standard math Scalar autonomous ODE for β(t) has non-crossing trajectories for NC=1 (smooth monotonic relaxation).
    True for β(t) itself by ODE uniqueness; the paper extends this to conclude distance functions d_ℓ(t) do not cross, which is not implied and is asserted.
  • domain assumption The normalized Frobenius distance d_ℓ on a small subsystem is an appropriate proxy for the Mpemba effect.
    The authors note the debate on distance definitions; the central claim depends on this choice.

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Pith. "Pith review of Conserved quantities enable the quantum Mpemba effect in weakly open systems." pith.science (2026). https://pith.science/paper/NRHPEMTV

@misc{pith2026251116739,
  author       = {Pith},
  title        = {Pith review of: Conserved quantities enable the quantum Mpemba effect in weakly open systems},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/NRHPEMTV}},
  note         = {Machine review of arXiv:2511.16739}
}
read the original abstract

Observation of the quantum Mpemba effect has spurred much interest in its enabling conditions and its relation to the classical counterpart. Here, we consider weakly open many-body quantum systems initialized in different thermal states and examine when the initially farther state relaxes to the (non-equilibrium) steady state faster. We claim that the number of conserved quantities in the unitary part plays a crucial role: the Mpemba effect is possible only when the Hamiltonian commutes with other extensive operators or is integrable. The reason lies in the dynamical evolution happening in spaces of different dimensions. When energy is the only approximately conserved quantity, dissipation pushes the dynamics within a single-parameter manifold of different thermal states. In contrast, for Hamiltonians with several conserved quantities, the dynamics drift in the multi-dimensional space of generalized Gibbs ensembles, whose distance to the steady state is less trivial. We provide numerical results for large system sizes using tensor networks and free-fermion techniques, thereby supporting our claim.

Figures

Figures reproduced from arXiv: 2511.16739 by the authors.

Figure 1
Figure 1. FIG. 1. We consider many-body quantum systems with uni [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. (a,b) shows distance dℓ(ρ(ϵt), ρ∞), Eq. (5), as a function of the rescaled time ϵt for the initial ther￾mal states with a colder βc = 0.15 (blue) and a hotter βh = 0 (red) inverse temperature on support ℓ = 2 for (a) chaotic H and (b) integrable H. According to our dis￾tance measure (5), the hotter initial state is farther away from the steady state. Solid lines denote different cou￾pling strengths, ϵ = 0.05, 0.2, 0… view at source ↗
Figure 3
Figure 3. FIG. 3. Distances [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (3 more)
Figure 5
Figure 5. Figure 5: FIG. 5. Normalized overlap of different thermal states [PITH_FULL_IMAGE:figures/full_fig_p008_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6. Integrable transverse field Ising model: Initial dis [PITH_FULL_IMAGE:figures/full_fig_p009_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7. Orthogonality analysis for model ( [PITH_FULL_IMAGE:figures/full_fig_p009_7.png]

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