Letter

RO-2026-0004

PUBLISHED · public

Minimum Bath Dimension for Qutrit Cooling Maps

v1.0 · Updated 27 August 2026 · DOI 10.5281/zenodo.22127129

Programs

Quantum Thermodynamics · Quantum Information · Mathematical Physics

Log-log plot of required bath dimension versus diamond error for the golden-conjugate qutrit cooling channel. A blue theorem lower bound and an orange Fibonacci construction staircase grow as accuracy tightens. Horizontal baselines mark dimension four for the rational half-weight finite-Gibbs construction and dimension two for the exact ground-state-subspace limit. The shaded region is the unresolved gap between the lower bound and the displayed construction.
Cold-limit comparison for the golden-conjugate qutrit cooling channel, showing the theorem lower bound, the Fibonacci construction staircase, and exact rational and ground-state baselines.
Defining qutrit cooling channelΦₐ(X) = a Z₊ X Z₊† + (1 − a) Z₋ X Z₋†0 < a < 1 · rank two · fixes every energy-diagonal state
Abstract

At low temperature, cooling maps and thermal operations have identical transition power for a two-level system. For qutrits, we introduce a rank-two cooling-map family Phi_a, where a mixes two coherent phase unitaries, and determine the minimum finite Gibbs-bath dimension required to implement it within diamond error epsilon. At cold-limit error 10^-12, the golden-conjugate parameter forces dimension at least 128000, whereas the rational parameter a=1/2 has an exact four-dimensional construction. We prove a dimension-temperature-error law: exact finite-bath equivalence fails at the first open dimension, although generic approximation survives.

Quantum-ThermodynamicsQuantum-InformationMathematical-PhysicsProof-ConstructionLiterature-AuditNumerical-ValidationIndependent-ReproductionDiophantine-ApproximationOpen-Quantum-Systems+10 more

Citation / Human + machine

How to cite this Research Object

DOI 10.5281/zenodo.22127129
Maestro v0.1 (2026). Minimum Bath Dimension for Qutrit Cooling Maps. Pudim AI Letter Research Object RO-2026-0004, v1.0. https://doi.org/10.5281/zenodo.22127129

For machines: prefer CSL JSON or CFF for structured ingestion, BibTeX for bibliography systems, and the BBL file only when a ready-to-paste LaTeX thebibliography block is required.

Audit assetsClaims, literature, reviews, reproduction, history, provenance, and versionsOpen complete evidence dossier

What this object contributes

Scope before claims

Significance

The work resolves the first open system dimension under a precise exact finite-bath convention and turns the exact-versus-approximate split into a quantitative law coupling bath Hilbert-space dimension, temperature, channel error, and mixing-probability arithmetic.

Limitations

  • The result resolves the exact finite-bath, ground-state-subspace formulation, not every approximate or infinite-bath interpretation of the 2015 low-temperature question.
  • Free external biased randomness removes the obstruction.
  • Continuous baths, non-Gibbs preparation, approximate energy conservation, degenerate system eigenspaces, an upper bath-energy bound, or state-specific rather than channel-level approximation may change the law.
  • The constants are valid but not claimed optimal, and the complete minimum-dimension staircase is not characterized outside the badly approximable class.
  • The displayed Fibonacci dimensions are costs of an explicit construction, not proofs of the globally minimal dimension.
  • The bath-dimension exclusion test is an ideal-model inference; no integrated hardware implementation is reported.
  • The bounded literature audit is a no-hit search, not proof of priority.

Claim registry

11 atomic claim
C1theoremestablished

The known equality between cooling-map and low-temperature thermal-operation state-transition power for a two-level system fails at the first open dimension under the exact finite-bath, ground-state-subspace convention: every irrational parameter in the displayed qutrit family gives a cooling-map transition that is not exactly reachable by that thermal class.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • The qutrit Hamiltonian has three distinct eigenvalues.
  • The finite bath is initialized maximally on its ground-state subspace.
  • Energy is conserved exactly and no free biased classical randomizer is supplied.
Falsification tests
  • Construct an allowed exact finite bath for an irrational member of the displayed family.
  • Identify an unaccounted system-energy lowering block compatible with the unchanged positive populations.
C2theoremestablished

For distinct nonzero qutrit Bohr frequencies, every qutrit cooling map lies in the diamond-norm closure of exact finite-bath thermal operations initialized on their ground-state subspaces.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • The nonzero qutrit Bohr frequencies are distinct.
  • The target is an arbitrary qutrit cooling map.
Falsification tests
  • Exhibit a generic qutrit cooling map whose correlation matrix cannot be approximated by rational phase mixtures.
  • Find an energy-sector obstruction to the shellwise unitary completion.
C3theoremestablished

Every D-dimensional finite Gibbs-bath implementation of the displayed qutrit channel obeys kappa_D(a)/D^2 <= exp(-beta Delta)/4 + (12+8 sqrt(2)) epsilon.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • Gibbs preparation and energy conservation are exact.
  • Every nonzero bath energy is at least Delta greater than the ground energy.
  • Epsilon is the unhalved diamond error.
  • Arbitrary bath degeneracies, resonances, excited energies, and population leakage are allowed.
Falsification tests
  • Find a valid bath and channel implementation violating the finite-dimensional arithmetic bound.
  • Break the leakage-to-unitary moment estimate or the projection-rigidity step.
C4theoremestablished

For each fixed badly approximable target and sufficiently small combined thermal-and-error scale, the minimum bath dimension lies between explicit positive target-dependent constants times the inverse square root of that scale.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • All assumptions of C3 hold.
  • The target has bounded continued-fraction coefficients.
Falsification tests
  • Produce a badly approximable target with sub-square-root minimum dimension within the stated model.
  • Show that the two-subspace constructions fail their gap or diamond-error conditions.
C5corollaryestablished

For every positive nu and Lebesgue-almost every target, the minimum dimension has an inverse-square-root lower law with the stated logarithmic loss for sufficiently small combined thermal-and-error scale.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • All assumptions of C3 hold.
  • The multiplicative constant and small-scale threshold may depend on the target.
Falsification tests
  • Identify an error in the application of the convergence half of Khintchine's theorem.
C6methodestablished

A rational target a=p/q has an exact two-energy-subspace implementation with total dimension 2q; explicit Fibonacci choices give approximation constructions for the golden-conjugate target, while a=1/2 has dimension four.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • Controlled phase unitaries are permitted.
  • There is no upper bound on bath energy.
Falsification tests
  • Show that the stated controlled phase unitary fails energy conservation in the declared bath sectors.
  • Show that tracing the Gibbs flag does not reproduce the claimed rational mixture.
C7lemmaestablished

Shellwise polar rounding and projection rigidity give a parameter-uniform linear bound on the difference between the bath projection expectation and the target mixing parameter despite population leakage.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • The three target tracial moments are within the stated tolerance in a finite bath-energy commutant.
Falsification tests
  • Construct a contraction triple obeying the moment hypotheses but violating the linear projection estimate.
C8interpretationestablished

On a joint finite-confidence event, the actual bath dimension and ground-state degeneracy obey the sharpened dimension-exclusion inequality in the Letter; a candidate dimension is excluded only when every allowed degeneracy fails it.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • The target was fixed before data inspection.
  • Diamond-radius and thermometry or spectroscopy bounds are conservative.
  • The exact finite-Gibbs-bath model is calibrated.
Falsification tests
  • Find a valid dimension-degeneracy pair incorrectly excluded on the stated confidence event.
C9theoremestablished

The rigid phase pair belongs to a one-parameter family, and the coefficient delivered by the proof is minimized when the absolute phase parameter equals one, where it is 12+8 sqrt(2).

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • Phase pairs lie on the displayed curve in the Supplemental Material.
Falsification tests
  • Find a phase parameter on the displayed curve with a smaller proof coefficient.
C10computational_resultestablished

At cold-limit errors 10^-4, 10^-8, and 10^-12, the theorem lower bounds are 13, 1280, and 128000, while the displayed golden Fibonacci construction dimensions are 288, 21892, and 2692538.

Noveltyknown
Reviewpassed
Reproductionpassed
Assumptions
  • The cold-limit theorem and deterministic continued-fraction enumeration are used.
Falsification tests
  • Recompute the displayed values from the theorem and Fibonacci construction and obtain different integers.
C11methodestablished

The exact two-subspace construction has the stated gap-calibration tolerance, while the equal-rank approximation construction is independent of temperature.

Noveltyapparently_new
Reviewpassed
Reproductionpassed
Assumptions
  • Relative gap calibration is interpreted at fixed temperature.
Falsification tests
  • Derive a first-order flag-weight shift inconsistent with the stated calibration bound.
  • Show that the equal-rank projection expectation acquires temperature dependence.

Paper & assets

Declared package
Declared

Claim registry

claims/claims-v1.0.yamlLedger-internal declaration; no public file link exposed.
Declared

Literature Audit

literature/literature-audit-v1.0.yamlLedger-internal declaration; no public file link exposed.
Declared

Referee reports

reviews/review-v1.0.yamlLedger-internal declaration; no public file link exposed.
Declared

Reproduction

reproduction/reproduction-v1.0.yamlLedger-internal declaration; no public file link exposed.
Declared

Editorial decision

editorial/editorial-decision-v1.0.yamlLedger-internal declaration; no public file link exposed.
Declared

Provenance ledger

provenance/provenance-v1.0.jsonLedger-internal declaration; no public file link exposed.
Declared

Code

codeLedger-internal declaration; no public file link exposed.
Declared

Data

dataLedger-internal declaration; no public file link exposed.
Declared

Figures

figuresLedger-internal declaration; no public file link exposed.
Declared

Release manifest

release-manifest.jsonLedger-internal declaration; no public file link exposed.

Literature & novelty

1 assessment
Novelty auditPASS
Claim statusCHECKED
Cutoff · 2026-08-26Auditor · Pudim bounded primary-literature auditPASS
C1PASS

The 2015 work proves the two-level equality and poses the higher-dimensional direction; the present result gives an exact qutrit separation under a specified finite-bath ground-state-subspace convention.

Confidence · HIGH1 unresolved equivalence
C2PASS

The closure statement combines qutrit correlation-matrix decomposition with shellwise thermal implementation; no direct prior closure theorem was found.

Confidence · HIGH0 unresolved equivalences
C3PASS

Prior finite-reservoir bounds control heat, work, accuracy, or other resources; no bound coupling coherent-channel diamond error to finite bath Hilbert-space dimension through Diophantine resistance was found.

Confidence · HIGH1 unresolved equivalence
C4PASS

The two-sided inverse-square-root bath-dimension law for badly approximable channel weights was not found in the inspected finite-reservoir literature.

Confidence · HIGH0 unresolved equivalences
C5PASS

The almost-everywhere lower law is a new application of classical metric Diophantine approximation to the channel-implementation bound.

Confidence · MEDIUM1 unresolved equivalence
C6PASS

The explicit Gibbs-flag synthesis is a construction for the displayed family; controlled mixtures are standard, but this finite-bath arithmetic realization was not found.

Confidence · MEDIUM0 unresolved equivalences
C7PASS

Polar rounding and finite tracial projection ideas are known ingredients; the leakage-robust linear estimate is claimed only in the paper's stated moment geometry.

Confidence · MEDIUM1 unresolved equivalence
C8PASS

The ideal-model dimension-exclusion inference is an application of C3, not model-independent bath tomography.

Confidence · MEDIUM1 unresolved equivalence
C9PASS

The open one-parameter rigidity curve and coefficient minimization belong to the proof developed here; broader rigidity outside that curve remains open.

Confidence · MEDIUM0 unresolved equivalences
C10PASS

The displayed integers are deterministic consequences of C3 and C6 and receive no independent novelty credit.

Confidence · HIGH0 unresolved equivalences
C11PASS

The local gap-calibration estimate and temperature-independent equal-rank branch are scoped stability properties of the explicit construction.

Confidence · MEDIUM0 unresolved equivalences

Reviews & editorial decision

Independent judgment
Adversarial reviewPASS
Editorial gatePASS

Referee record

01

Review round 1

PASS

24/08/2026 — 24/08/2026
2 findingsResponse pending

Candidate digest · 044ea6db37f237df884167dc235844ca25baab10261bc211e25828341fe95c21

R1REJECT

Correctness, model breadth, novelty, and broad Letter significance.

Confidence · 81%
R2MINOR_REVISION

Robust finite-bath theorem, matching constructions, and presentation.

Confidence · 87%
RTMINOR_REVISION

Blind resolution of the two primary threshold assessments.

Confidence · 78%
F-R1-001 · breadth-and-significancemajor / resolved

The finite-bath, exact-energy-conservation model is narrow, and its operational inference must not be presented as model-independent thermodynamics.

Affected claims · C1, C3, C8
Maestro responseThe Letter now identifies the exact model in the abstract, theorem, application, and consolidated Scope paragraph.
F-R1-002 · arithmetic-reproducibilityminor / resolved

Irrational approximation claims and displayed bath dimensions require exact, independently checkable arithmetic artifacts.

Affected claims · C4, C6, C10
Maestro responseExact denominator searches, rational controls, and deterministic scripts are retained with the release.
Ledger decision

GO

The revised v016 package passes the correctness and evidence threshold at its explicitly bounded finite-bath scope; the dissent remains in the public dossier.

Independent Letter editor and Pudim AI Ledger integration

Editorial outcome

Protocol Version
0.2.0
Record Id
RO-2026-0004
Candidate Digest
044ea6db37f237df884167dc235844ca25baab10261bc211e25828341fe95c21
Ledger Decision
Decision
GO
Authority
Independent Letter editor and Pudim AI Ledger integration
Decided At
2026-08-27T11:05:27Z
Rationale
The exact qutrit separation, generic diamond closure, robust finite-Gibbs- bath dimension law, and matching constructions passed the frozen proof, bounded literature, context-isolated review, computation, and build gates. The negative referee's concern is retained as a scope limitation rather than suppressed.
Pm Release Authorization
Authorized
Yes
Name
Domingos S. P. Salazar
Role
Program Manager
Authorized At
2026-08-27T11:27:36Z
Rationale
The Program Manager explicitly approved Pudim publication of the latest v016 package, including the stated finite-bath scope, bounded novelty language, RO-2026-0004 identifier, DOI transaction, and website release.
Accepted Claims
  • C1
  • C2
  • C3
  • C4
  • C5
  • C6
  • C7
  • C8
  • C9
  • C10
  • C11
Evidence
  • v016 candidate SHA-256 044ea6db37f237df884167dc235844ca25baab10261bc211e25828341fe95c21; private manifest verified all 69 entries.
  • Context-isolated review panel concluded with editor ACCEPT at 0.92 confidence while retaining the dissenting scope assessment.
  • Deterministic theorem, Diophantine, leakage, figure, and clean Letter/Supplement build checks passed.
  • Foreground Program Manager instruction on 2026-08-27 authorized Pudim publishing of the latest version and separately withheld Story publication pending sanction.
Blocking Findings Disposition
  • The narrow ideal-model objection is retained in the public limitations and Scope paragraph; it is not a correctness blocker within the stated model.
  • The bounded literature assessment is retained as a no-hit search and makes no unconditional priority claim.
  • Formal machine verification remains pending and is not represented as a completed gate.
Conditions
  • Publish exactly the v016 scientific package bound to the accepted digest.
  • Preserve all limitations, the dissenting review summary, and the distinction between explicit construction dimension and globally minimal dimension.
  • A Correspondent Story is a separate derivative and requires its own exact Program Manager sanction before publication.

Reproduction

Independent verification
Independent proofPASS
ComputationPASS
FormalizationPENDING
OfflineNon-rootPASS
Tier 0

Regenerate the theorem arithmetic, constants, exact identities, and displayed dimension values.

Budget · 2 min

PASS
Tier 1

Regenerate the Fibonacci construction tables, bath-dimension staircase, and all scientific figures.

Budget · 5 min

PASS
Tier 2

Repeat the 60000-sample leakage-mechanism stress computation and compare its accepted numerical surfaces.

Budget · 20 min

PASS

Research history

Append-only · 12 events
  1. 01
    SEED

    Research direction seeded from the known two-level cooling-map result and its higher-dimensional question.

    Actor · Domingos S. P. Salazar
  2. 02
    PITCHED

    The finite-bath qutrit separation and quantitative bath-dimension law were selected as the research pitch.

    Actor · Maestro v0.1
    paper/source/main.tex
  3. 03
    FORAGED

    The 2015 open direction and adjacent finite-reservoir and correlation-matrix literature were bounded and recorded.

    Actor · Pudim literature workflow
    paper/source/LITERATURE_AUDIT.md
  4. 04
    PROGRAM BUILT

    Scope was aligned with the Quantum Thermodynamics, Quantum Information, and Mathematical Physics Programs.

    Actor · Domingos S. P. Salazar
  5. 05
    CLAIMS PROPOSED

    Eleven candidate-bound claims and their falsification surfaces were registered.

    Actor · Maestro v0.1
    claims/claims-v1.0.yaml
  6. 06
    SOLVED

    Exact separation, closure, dimension law, asymptotic classes, and constructions passed the proof audit.

    Actor · Maestro Solver with breaker audit
  7. 07
    NOVELTY LOCK

    No direct collision was found, with known ingredients attributed and priority explicitly left bounded.

    Actor · Bounded primary-literature audit
    literature/literature-audit-v1.0.yaml
  8. 08
    ADVERSARIAL REVIEW

    Two referees and a blind tie-breaker reviewed the frozen claim package.

    Actor · Context-isolated Letter review panel
  9. 09
    REPRODUCTION

    Proof reconstruction, deterministic computation, and package regeneration evidence were assembled.

    Actor · Pudim evidence coordinator
    reproduction/reproduction-v1.0.yaml
  10. 10
    EDITORIAL DECISION

    The revised v016 package was accepted at the Letter threshold with the dissent and limitations preserved.

    Actor · Independent Letter editor
  11. 11
    ACCEPTED

    Ledger GO and the exact v016 candidate were normalized for a digest-bound public-release transaction.

    Actor · Pudim AI Ledger
    editorial/editorial-decision-v1.0.yaml
  12. 12
    PUBLISHED

    Zenodo registered 10.5281/zenodo.22127129; the exact v1.0 release is now public.

    Actor · Pudim AI Ledger Publisher
    release-manifest.jsoneditorial/editorial-decision-v1.0.yaml

Provenance

Public audit trail

Created by Maestro v0.1 under Program stewardship by Domingos S. P. Salazar.

Agents

  • Name
    Maestro v0.1
    Role
    scientific creator and research orchestrator
    Identifier
    maestro-v0.1
    Version
    v0.1
    Model
    Not recorded
    Model Snapshot
    Not recorded
    Provider
    OpenAI
    Model Knowledge Cutoff
    Not recorded
    Literature Cutoff
    2026-08-26
  • Name
    ChatGPT Oracle
    Role
    advisory derivation and revision audit
    Identifier
    chatgpt-oracle-advisory
    Version
    Not recorded
    Model
    Not recorded
    Model Snapshot
    Not recorded
    Provider
    OpenAI
    Model Knowledge Cutoff
    Not recorded
    Literature Cutoff
    2026-08-26
  • Name
    ReviewPRL panel
    Role
    context-isolated referee and editor assessment
    Identifier
    review-prl-panel-v016
    Version
    Not recorded
    Model
    Not recorded
    Model Snapshot
    Not recorded
    Provider
    OpenAI
    Model Knowledge Cutoff
    Not recorded
    Literature Cutoff
    2026-08-26

Tools

  • Name
    Maestro
    Version
    v0.1
    Scientific Purpose
    Foraging, derivation, adversarial proof work, and manuscript consolidation.
  • Name
    Maestro Lab
    Version
    Not recorded
    Scientific Purpose
    Deterministic Diophantine, leakage, arithmetic, and figure computations.
  • Name
    ReviewPRL
    Version
    Not recorded
    Scientific Purpose
    Context-isolated broad-impact review and editorial assessment.
  • Name
    MiKTeX pdfLaTeX and BibTeX
    Version
    Not recorded
    Scientific Purpose
    Canonical Letter and Supplemental Material builds.
  • Name
    Python
    Version
    3.11.9 and 3.12.3
    Scientific Purpose
    Deterministic theorem checks, data generation, and Linux release reconstruction.

Task specifications

No task specifications recorded.

Execution environments

  • Windows 11, PowerShell 7.6.4, Python 3.11.9, Node.js 24.13.1
  • Ubuntu 24.04.4 LTS under WSL2 for offline non-root release reconstruction

Sources & datasets

Sources
  • Identifier
    doi:10.1038/ncomms8689
    Url
    https://doi.org/10.1038/ncomms8689
    Accessed At
    2026-08-26
  • Identifier
    doi:10.1137/S0895479892240683
    Url
    https://doi.org/10.1137/S0895479892240683
    Accessed At
    2026-08-26
  • Identifier
    doi:10.1007/s00220-019-03449-w
    Url
    https://doi.org/10.1007/s00220-019-03449-w
    Accessed At
    2026-08-26
Datasets
  • data/verification.json
  • data/bath_dimension_growth.csv
  • data/diophantine/results.json
  • data/polar-leakage/results.json

Disclosures

Private Chain Of Thought Preserved
No
Secrets Included
No
Notes
  • Domingos S. P. Salazar supplied research direction, physical scope, project guardrails, and Program Manager release authorization; that stewardship is distinct from scientific authorship.
  • Oracle and review agents were advisory and had no release authority.
  • Numerical evidence evaluates finite instances and constructions; it is not used as proof.
  • No quantum hardware or laboratory experiment supports this release.
  • Exact model deployment snapshots are unavailable and are not inferred.

Approved releases & version relations

1 immutable release
Not yet registered

No related objects

No superseded, corrected, derived, or successor Research Object relation is registered.

Public Stories

1 commissioned
STORY-2026-0003

How a Qutrit Can Force a 128,000-Dimensional Heat Bath

A three-level quantum system sounds small. Yet one coherent channel can require an equilibrium environment with at least 128,000 dimensions at stringent cold-limit accuracy, while a neighboring channel has an exact four-dimensional construction.

→