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All instances / Heisenberg

Heisenberg pyrochlore 4x4x4 (1024 sites)

Best values (rules §6)

best variational -0.48800(1) VMC (PP)
Pohle et al. (2023) · the lowest unflagged variational energy, a strict variational bound
best extrapolated -0.4921(2) VMC (PP)
Pohle et al. (2023) · the lowest unflagged extrapolated energy, an extrapolation, not a bound

Energies as E/N (S.S). Classes are different claims and are not ranked against each other.

The Hamiltonian

H = ∑⟨ij⟩ σi·σj

Nearest-neighbour Heisenberg antiferromagnet, J = 1, written with Pauli matrices.

lattice
pyrochlore-4x4x4
sites
1024
boundary
periodic
energies
3

Stored as a total energy; quoted here as E/N (S.S), which is what the papers report (how the conversion works).

Every published energy

Grouped by what the number is. The exact energy comes first where there is one; in every other group the lowest unflagged energy is its best value, and each row's distance is to that best (rules §6).

Strict variational upper bounds (2)

Energies that a variational state reached (VMC, DMRG and MPS at finite bond dimension, PEPS, NQS, VQE). Each is an upper bound on the ground-state energy.

E/N (S.S)distance to class bestσVar(E)V-score methodsourcecodeyearcomment
-0.48800best variational 0 1.2e-5 1.86e+2 4.8e-2 VMC (PP) Pohle et al. (2023) run script 2023
-0.48537 2.6e-3 1.0e-5 3.03e+2 7.8e-2 VMC (PP)
preprint
Pohle et al. (2023) uses mVMC 2023

Extrapolations (1)

Zero-variance or bond-dimension extrapolations. These are not bounds: no ansatz reached the number.

E/N (S.S)distance to class bestσVar(E)V-score methodsourcecodeyearcomment
-0.4921best extrapolated 0 2.0e-4 n/a n/a VMC (PP)
preprint
Pohle et al. (2023) uses mVMC 2023

How these numbers were read

Where each number below was read, and how it was checked.

-0.4921(2), VMC (PP)

Checked 2026-09-15 · source text of arXiv:2311.11561 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; verified 2026-09-16 by an independent second reading (arXiv versions, VarBench history)

Reported as. −0.4921(2)

Supplemental Material Table SIII of arXiv:2311.11561 (v1, the only version; pdftotext layout of the committed PDF) | E/Ns in S.S units with periodic boundaries (caption and Eq. 1); sigma^2 is the relative variance (<E^2>-<E>^2)/<E>^2 of Eq. S26, stored as energy_variance = sigma^2 x E^2 in the instance's units

-0.48800(1), VMC (PP)

Checked 2026-09-29 · arXiv:2311.11561v1 (only version; 34-page PDF with the Supplemental Material appended), pypdf plain + layout (sources/2311.11561v1.va5.*; the layout pass loses the SM tables to rotated text, the plain pass keeps them) and per-page search

Reported as. -0.48800(1) per site (E/Ns, S.S units); sigma^2 = 0.0000464(7) (relative variance, Eq. S26)

Record row. Cubic L = 4 cluster (16 sites per cubic cell), PBC, J = 1, spin-parity-even singlet sector, C3 point-group projection (Table SIII caption: 'Optimizations were initiated from random initial wave functions with imposed C3 point-group symmetry projections'), one Lanczos step on the variational state: variational. Energy, bar and variance all agree with the printed cell to its precision, so the finer stored digits are the same evaluation as the print (first author R. Pohle's VarBench upload of 2022-02-26, never changed); kept under the 2026-09-16 ruling on the author's finer digits. Runner-up mVMC (Table SIII row 'mVMC') -1988.07552, 0.54 % higher; the E0 row -2015.6416 is extrapolated. Not a duplicate: no other row on the instance carries -0.48800. The linked VarBench input reproduces only the C3-projected optimisation (NQPTrans 3, NLanczosMode 0), not the Lanczos-step evaluation. Venue: arXiv preprint only (first author's list, 2026-09-29), older than 12 months (M10 stale-preprint).

-0.48537(1), VMC (PP)

Checked 2026-09-15 · source text of arXiv:2311.11561 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; verified 2026-09-16 by an independent second reading (arXiv versions, VarBench history)

Reported as. −0.48537(1), sigma^2 = 0.00007664(27)

Supplemental Material Table SIII of arXiv:2311.11561 (v1, the only version; pdftotext layout of the committed PDF) | E/Ns in S.S units with periodic boundaries (caption and Eq. 1); sigma^2 is the relative variance (<E^2>-<E>^2)/<E>^2 of Eq. S26, stored as energy_variance = sigma^2 x E^2 in the instance's units

Coverage

Newest published number here: 2023. Literature last checked 2026-09-15 (citation screen of Pohle et al. 2023 (arXiv:2311.11561, pyrochlore): citing works from OpenAlex and Semantic Scholar (scripts/cited_by.mjs)): 2 papers read, 0 of them with an energy on this page.

This instance as data

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