Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:2608.02452

Confinement as Decoding: Higher Form Codes and Lattice Yang-Mills Theory

Ning Bao

Published Aug 3, 2026• 0 citations
arXivHTMLPDF

Abstract

We study the relationship between quantum error correction, confinement, and lattice Yang-Mills theory. We first formulate decoding for finite Abelian homological codes in terms of higher form gauge fields. For positive local noise, the logical classes are topological sectors of a Nishimori ensemble, and the optimal decoding error is determined by the relative weights of the nontrivial sectors. We derive Fourier relations between logical probabilities, disorder operators, and information in the channel environment, and we give contour and fractional moment criteria for a threshold. We then study a four dimensional $\Z_N$ memory and its possible relation to confining $\PSU(N)$ vacua. Finally, we define a finite curvature center sheet model coupled to Wilson $\SU(N)$ link variables. In this model the conditional logical probabilities are center twisted Yang-Mills partition functions. A strong coupling expansion gives the leading effective interaction for the syndrome and shows that local syndrome correlations can decay even when the global sheet sectors are mixed. We also show that the likelihood for a separated pair of syndrome worldlines is the center monopole correlator. Its decay determines a transfer matrix mass. This distinguishes the suppression of global flux sectors from the local spectral information needed to discuss a mass gap.

DOI
10.48550/arxiv.2608.02452

Related papers

Theory of Operator Physics (TOP) II: Constructive Yang–Mills Theory, Confinement, and the Mass Gap

Paul Michel

We develop a constructive, entanglement-first derivation of quantum field theory in which all physical structure arises from a single operator relation, ρ = e −S(H) . The fundamental object is the correlation matrix Cij = ⟨λi |ρ|λj ⟩, from which locality, spectral geometry, renormalization flow, and interaction structure are derived without prior assumptions of spacetime, fields, or gauge symmetry. We show that the conventional kernel formulation is a projection of the full entanglement structure and is therefore insufficient to reconstruct physical dynamics, establishing operator entanglement as the unique fundamental layer. Within this framework, non-Abelian gauge structure emerges from symmetry-induced degeneracies of the entanglement operator, yielding a natural construction of gauge connections and curvature. The Yang–Mills action is derived as the leading gauge-invariant functional consistent with entanglement-induced locality and spectral scaling, rather than postulated. In the strong-coupling regime, exponential decay of correlations implies clustering, a nonzero mass gap, and an area law for Wilson loops, providing a nonperturbative mechanism for confinement. We further construct the full quantum theory via an entanglement-induced measure, verifying all Osterwalder–Schrader axioms and establishing Hilbert space reconstruction, uniqueness of the continuum limit, universality, vacuum uniqueness, and operator-domain control. The resulting framework provides a unified and constructive foundation for quantum field theory in which Yang–Mills dynamics and nonperturbative phenomena arise directly from operator entanglement.

•Apr 13, 2026•0 citations

Mixed-state topological order and error-correction thresholds in non-Abelian codes: rigorous results

Sun Woo P. Kim, Max McGinley

We present a versatile and mathematically rigorous technique for bounding recovery thresholds in topological codes subject to noise. Our method captures the effect of applying an arbitrary (possibly non-Pauli) local noise channel to the code state of a broad class of two-dimensional codes, including surface codes, non-Abelian quantum doubles, and string-net codes. In each case, we prove that for noise strengths up to some explicit constant value, any initially encoded logical information can be recovered to high precision, and that the noise-corrupted state exhibits key hallmarks of mixed-state topological order: long-range entanglement and emergent higher-form symmetries. We also describe how these methods can be adapted to higher dimensions and correlated noise models.

quant-pharXiv:2607.21706•Jul 27, 2026•0 citations

Quantum Yang-Mills theory: An overview of a program

Ashley Milsted, Tobias J. Osborne

We present an overview of a program to understand the low-energy physics of quantum Yang-Mills theory from a quantum-information perspective. Our setting is that of the Hamiltonian formulation of pure Yang-Mills theory in the temporal gauge on the lattice. Firstly, inspired by recent constructions for $\mathbb{Z}/2\mathbb{Z}$ lattice gauge theory, in particular, Kitaev's toric code, we describe the gauge-invariant sector of Hilbert space by introducing a primitive quantum gate: the quantum parallel transporter. We then develop a non-Abelian generalization of Laplace interpolation to present an ansatz for the ground state of pure Yang-Mills theory which interpolates between the weak- and strong-coupling renormalization group fixed points. The resulting state acquires the structure of a tensor network, namely, a multiscale entanglement renormalization ansatz, and allows for the efficient computation of local observables and Wilson loops. Various refinements of the tensor network are discussed leading to several generalizations. Finally, the continuum limit of our ansatz as the lattice regulator is removed is then described. This paper is intended as an abstract for an ongoing program: there are still many open problems.

arXiv:1604.01979•Physical review. D/Physical review. D.•Jul 10, 2018•18 citations

Fusion-assisted decoding of non-Abelian topological order

Rohith Sajith, Yabo Li, Zijian Song +2 more

Maximum likelihood (ML) decoders perform quantum error correction by measuring a set of syndromes, classically computing an optimal recovery based on these syndromes and the noise model, and then performing that recovery. ML decoders are well understood for the toric code and generalize straightforwardly to other surface codes with Abelian anyons, where they can saturate information-theoretic decoding thresholds. On the other hand, codes with non-Abelian anyons have become increasingly relevant because they can support transversal or constant-depth non-Clifford gates and admit efficient preparation protocols in modern quantum devices. However, they present new challenges for decoding: non-Abelian anyons cannot in general be deterministically annihilated, and the logical operators cannot be classified by Abelian homology. In this work, we show that refined syndrome sets, including measurements that resolve non-Abelian anyon fusion outcomes, systematically improve the performance of ML decoders. We demonstrate this concretely by constructing explicit decoders for the $D_4$ quantum double model under charge noise, and obtaining numerical results for thresholds via mappings to classical statistical-mechanics models. We show that there is a nonzero noise threshold below which the entire logical qudit can be recovered with a single round of measurements.

quant-pharXiv:2610.05901•Oct 6, 2026•0 citations

A diagrammatic field theory of quantum error correction

Steven Rayan

We develop a field-theoretic framework for quantum error correction centred on fusion-space codes in unitary fusion categories. Admissible clusters determine total-charge sectors and orthogonal footprint projectors recording locally visible data left by error histories. The central distinction is between diagnostic footprint algebras and syndrome-admissible commuting algebras: the latter can be measured without revealing logical information and resolve chosen error representatives into measured sectors. For such algebras, exact correctability is equivalent to fibrewise Knill--Laflamme conditions, yielding a measure-then-recover factorization. Under a contractible-vacuum locality hypothesis, closed neutral composites give a categorical sufficient criterion for scalar action on the code. In the Ising theory, four $σ$ punctures show that pair-charge footprints can be complementary logical diagnostics and realize an exact one-qubit Clifford shadow. A proper six-$σ$ code instead admits a syndrome-admissible pair-charge measurement and exact recovery from an explicit Majorana bilinear error. A second bilinear has the same measured footprint but differs by a logical bit flip, producing a concrete nontrivial footprint fibre and genuine decoding ambiguity. We also formulate conformal-block likelihood data and compute geometry-dependent Ising four-point weights. For growing code families, we prove a conditional Peierls-type threshold theorem: bounded connected-region growth, local stochastic noise, local neutralizability of small residual components, and componentwise decoder balance imply $\Pr_L(\mathrm{fail})\le C|Ω_L|e^{-cL}$ below a nonzero constant error rate. We conclude with representation-theoretic and algebro-geometric directions involving tube and Hopf algebras, Yangian-type structures, Higgs bundles, spectral curves, Jacobians, and abelian varieties.

quant-pharXiv:2607.08911•Jul 13, 2026•0 citations

Spectral Vacuum Mechanism - Part XIY Spectral Confinement as a Necessary Condition for Quantum Field Theory Confinement Gate-Induced Spectral Localization and Dimensional Constraints

Mikhail Nemirovsky

Abstract We formulate a minimal operator-theoretic criterion—the Spectral Confinement Class (SCC)—that any quantum theory exhibiting confinement-like behavior in four space-time dimensions should satisfy. This criterion consists of three necessary spectral properties: (i) a strict spectral gap above the vacuum, (ii) exponential clustering of connected correlation functions, and (iii) the absence of massless non-singlet excitations with respect to an internal compact symmetry (e.g., color). Within a general multichannel lattice framework, we prove that gate-induced spectral localization provides an explicit mechanism realizing SCC. Under minimal structural assumptions—local spectral rigidity with a gap m₀>0 uniform in the channel dimension N, bounded finite-range interactions, and a structural gate condition preventing spectral percolation—we derive a uniform lower bound on the spectral gap Δ ≥ m₀ - 2·z(d)·g·Vₘₐₓ where z(d)=2d is the lattice coordination number. The bound is uniform in system volume and channel dimension and exhibits a dimensional penalty: for fixed coupling g>0, the admissible gap window shrinks with increasing spatial dimension. We emphasize that SCC is necessary but not sufficient for confinement in the Yang–Mills sense. Its role is that of a spectral admissibility filter: candidate confining theories should satisfy SCC at the operator level; failure to do so presents obstacles to confinement regardless of gauge structure. In this sense, SCC functions as a spectral admissibility filter: candidate confining theories must satisfy it at the operator level, independently of gauge-theoretic or geometric mechanisms. Keywords Primary Keywords: spectral confinement class • spectral gap • gate condition • dimensional penalty • Yang–Mills theory • confinement • lattice Hamiltonians • multichannel systems • spectral localization Secondary Keywords: exponential clustering • local spectral rigidity • excitation projectors • coordination number • four-dimensional quantum field theory • gauge theories • Wilson loops • operator theory • variational methods • mass gap problem Mathematical Subject Classification (MSC 2020): Primary: 81T13 (Yang-Mills and other gauge theories), 81Q10 (Selfadjoint operator theory in quantum mechanics) Secondary: 82B20 (Lattice systems), 47A10 (Spectrum and spectral theory)

•Jan 3, 2026•0 citations
We study the relationship between quantum error correction, confinement, and lattice Yang-Mills theory. We first formulate decoding for finite Abelian homological codes in terms of higher form gauge fields. For positive local noise, the logical classes are topological sectors of a Nishimori ensemble, and the optimal decoding error is determined by the relative weights of the nontrivial sectors. We derive Fourier relations between logical probabilities, disorder operators, and information in the channel environment, and we give contour and fractional moment criteria for a threshold. We then study a four dimensional ZN\Z_NZN​ memory and its possible relation to confining \PSU(N)\PSU(N)\PSU(N) vacua. Finally, we define a finite curvature center sheet model coupled to Wilson \SU(N)\SU(N)\SU(N) link variables. In this model the conditional logical probabilities are center twisted Yang-Mills partition functions. A strong coupling expansion gives the leading effective interaction for the syndrome and shows that local syndrome correlations can decay even when the global sheet sectors are mixed. We also show that the likelihood for a separated pair of syndrome worldlines is the center monopole correlator. Its decay determines a transfer matrix mass. This distinguishes the suppression of global flux sectors from the local spectral information needed to discuss a mass gap.
We develop a constructive, entanglement-first derivation of quantum field theory in which all physical structure arises from a single operator relation, ρ = e −S(H) . The fundamental object is the correlation matrix Cij = ⟨λi |ρ|λj ⟩, from which locality, spectral geometry, renormalization flow, and interaction structure are derived without prior assumptions of spacetime, fields, or gauge symmetry. We show that the conventional kernel formulation is a projection of the full entanglement structure and is therefore insufficient to reconstruct physical dynamics, establishing operator entanglement as the unique fundamental layer. Within this framework, non-Abelian gauge structure emerges from symmetry-induced degeneracies of the entanglement operator, yielding a natural construction of gauge connections and curvature. The Yang–Mills action is derived as the leading gauge-invariant functional consistent with entanglement-induced locality and spectral scaling, rather than postulated. In the strong-coupling regime, exponential decay of correlations implies clustering, a nonzero mass gap, and an area law for Wilson loops, providing a nonperturbative mechanism for confinement. We further construct the full quantum theory via an entanglement-induced measure, verifying all Osterwalder–Schrader axioms and establishing Hilbert space reconstruction, uniqueness of the continuum limit, universality, vacuum uniqueness, and operator-domain control. The resulting framework provides a unified and constructive foundation for quantum field theory in which Yang–Mills dynamics and nonperturbative phenomena arise directly from operator entanglement.
We present a versatile and mathematically rigorous technique for bounding recovery thresholds in topological codes subject to noise. Our method captures the effect of applying an arbitrary (possibly non-Pauli) local noise channel to the code state of a broad class of two-dimensional codes, including surface codes, non-Abelian quantum doubles, and string-net codes. In each case, we prove that for noise strengths up to some explicit constant value, any initially encoded logical information can be recovered to high precision, and that the noise-corrupted state exhibits key hallmarks of mixed-state topological order: long-range entanglement and emergent higher-form symmetries. We also describe how these methods can be adapted to higher dimensions and correlated noise models.
We present an overview of a program to understand the low-energy physics of quantum Yang-Mills theory from a quantum-information perspective. Our setting is that of the Hamiltonian formulation of pure Yang-Mills theory in the temporal gauge on the lattice. Firstly, inspired by recent constructions for Z/2Z\mathbb{Z}/2\mathbb{Z}Z/2Z lattice gauge theory, in particular, Kitaev's toric code, we describe the gauge-invariant sector of Hilbert space by introducing a primitive quantum gate: the quantum parallel transporter. We then develop a non-Abelian generalization of Laplace interpolation to present an ansatz for the ground state of pure Yang-Mills theory which interpolates between the weak- and strong-coupling renormalization group fixed points. The resulting state acquires the structure of a tensor network, namely, a multiscale entanglement renormalization ansatz, and allows for the efficient computation of local observables and Wilson loops. Various refinements of the tensor network are discussed leading to several generalizations. Finally, the continuum limit of our ansatz as the lattice regulator is removed is then described. This paper is intended as an abstract for an ongoing program: there are still many open problems.
Maximum likelihood (ML) decoders perform quantum error correction by measuring a set of syndromes, classically computing an optimal recovery based on these syndromes and the noise model, and then performing that recovery. ML decoders are well understood for the toric code and generalize straightforwardly to other surface codes with Abelian anyons, where they can saturate information-theoretic decoding thresholds. On the other hand, codes with non-Abelian anyons have become increasingly relevant because they can support transversal or constant-depth non-Clifford gates and admit efficient preparation protocols in modern quantum devices. However, they present new challenges for decoding: non-Abelian anyons cannot in general be deterministically annihilated, and the logical operators cannot be classified by Abelian homology. In this work, we show that refined syndrome sets, including measurements that resolve non-Abelian anyon fusion outcomes, systematically improve the performance of ML decoders. We demonstrate this concretely by constructing explicit decoders for the D4D_4D4​ quantum double model under charge noise, and obtaining numerical results for thresholds via mappings to classical statistical-mechanics models. We show that there is a nonzero noise threshold below which the entire logical qudit can be recovered with a single round of measurements.
We develop a field-theoretic framework for quantum error correction centred on fusion-space codes in unitary fusion categories. Admissible clusters determine total-charge sectors and orthogonal footprint projectors recording locally visible data left by error histories. The central distinction is between diagnostic footprint algebras and syndrome-admissible commuting algebras: the latter can be measured without revealing logical information and resolve chosen error representatives into measured sectors. For such algebras, exact correctability is equivalent to fibrewise Knill--Laflamme conditions, yielding a measure-then-recover factorization. Under a contractible-vacuum locality hypothesis, closed neutral composites give a categorical sufficient criterion for scalar action on the code. In the Ising theory, four σσσ punctures show that pair-charge footprints can be complementary logical diagnostics and realize an exact one-qubit Clifford shadow. A proper six-σσσ code instead admits a syndrome-admissible pair-charge measurement and exact recovery from an explicit Majorana bilinear error. A second bilinear has the same measured footprint but differs by a logical bit flip, producing a concrete nontrivial footprint fibre and genuine decoding ambiguity. We also formulate conformal-block likelihood data and compute geometry-dependent Ising four-point weights. For growing code families, we prove a conditional Peierls-type threshold theorem: bounded connected-region growth, local stochastic noise, local neutralizability of small residual components, and componentwise decoder balance imply Pr⁡L(fail)≤C∣ΩL∣e−cL\Pr_L(\mathrm{fail})\le C|Ω_L|e^{-cL}PrL​(fail)≤C∣ΩL​∣e−cL below a nonzero constant error rate. We conclude with representation-theoretic and algebro-geometric directions involving tube and Hopf algebras, Yangian-type structures, Higgs bundles, spectral curves, Jacobians, and abelian varieties.
Abstract We formulate a minimal operator-theoretic criterion—the Spectral Confinement Class (SCC)—that any quantum theory exhibiting confinement-like behavior in four space-time dimensions should satisfy. This criterion consists of three necessary spectral properties: (i) a strict spectral gap above the vacuum, (ii) exponential clustering of connected correlation functions, and (iii) the absence of massless non-singlet excitations with respect to an internal compact symmetry (e.g., color). Within a general multichannel lattice framework, we prove that gate-induced spectral localization provides an explicit mechanism realizing SCC. Under minimal structural assumptions—local spectral rigidity with a gap m₀>0 uniform in the channel dimension N, bounded finite-range interactions, and a structural gate condition preventing spectral percolation—we derive a uniform lower bound on the spectral gap Δ ≥ m₀ - 2·z(d)·g·Vₘₐₓ where z(d)=2d is the lattice coordination number. The bound is uniform in system volume and channel dimension and exhibits a dimensional penalty: for fixed coupling g>0, the admissible gap window shrinks with increasing spatial dimension. We emphasize that SCC is necessary but not sufficient for confinement in the Yang–Mills sense. Its role is that of a spectral admissibility filter: candidate confining theories should satisfy SCC at the operator level; failure to do so presents obstacles to confinement regardless of gauge structure. In this sense, SCC functions as a spectral admissibility filter: candidate confining theories must satisfy it at the operator level, independently of gauge-theoretic or geometric mechanisms. Keywords Primary Keywords: spectral confinement class • spectral gap • gate condition • dimensional penalty • Yang–Mills theory • confinement • lattice Hamiltonians • multichannel systems • spectral localization Secondary Keywords: exponential clustering • local spectral rigidity • excitation projectors • coordination number • four-dimensional quantum field theory • gauge theories • Wilson loops • operator theory • variational methods • mass gap problem Mathematical Subject Classification (MSC 2020): Primary: 81T13 (Yang-Mills and other gauge theories), 81Q10 (Selfadjoint operator theory in quantum mechanics) Secondary: 82B20 (Lattice systems), 47A10 (Spectrum and spectral theory)