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Raw-Fragment Benchmarking for Redundancy Tests in Quantum Darwinism and Spectrum Broadcast Structure

Mingoo Kim

Published Jun 7, 2026• 0 citations
Publisher

Abstract

What does a rising redundancy curve actually prove? This deposit accompanies “Raw-Fragment Benchmarking for Redundancy Tests in Quantum Darwinism and Spectrum Broadcast Structure,” a paper built around a practical but often hidden problem in tests of quantum objectivity. Aggregate mutual-information curves can show that information grows with fragment size, but they do not reveal whether independent fragments really carry accessible, mutually consistent records of the same pointer variable. The missing evidence lives one level lower: in the raw, shot-indexed fragment records. The paper turns that gap into a reproducible benchmark. Starting from a fixed synthetic binary pointer-copy model with 100,000 shots and eight heterogeneous fragments, it asks what a raw-fragment evidence package should expose before redundancy, consensus, or Spectrum Broadcast Structure-style objectivity is inferred. The analysis enumerates all fragment subsets, separates mean-over-subsets and all-subsets threshold crossings, measures fragment disagreement, reproduces analytic binary-channel threshold maps, applies coupling-breaking negative controls, and stress-tests the result against hidden common-mode correlated errors. The resulting picture is sharper than an aggregate curve. In the baseline model, the 0.9 information-fraction threshold is crossed at subset size m=3 under the mean criterion, but only at m=4 under the stricter all-subsets criterion. Negative controls remain below threshold, while a hidden common-mode flip exposes the main fragility axis: many agreeing fragments can still fail as evidence for independent records if they share the same unobserved error source. The attached PDF gives the manuscript-level argument and results. The arXiv source package supports manuscript reproduction, and the ancillary benchmark archive contains the synthetic raw-shot data, subset diagnostics, disagreement tables, threshold maps, negative-control outputs, common-mode sensitivity maps, figures, scripts, manifests, and checksums. The scope is deliberately bounded. This is a synthetic/model-level benchmark and reproducibility package, not an experimental claim that Quantum Darwinism or Spectrum Broadcast Structure objectivity has been observed. Its purpose is to make explicit what future experimental raw-fragment evidence should provide before a plotted redundancy signature is treated as a claim of objective, independently accessible records.

DOI
10.5281/zenodo.20576977

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What does a rising redundancy curve actually prove? This deposit accompanies “Raw-Fragment Benchmarking for Redundancy Tests in Quantum Darwinism and Spectrum Broadcast Structure,” a paper built around a practical but often hidden problem in tests of quantum objectivity. Aggregate mutual-information curves can show that information grows with fragment size, but they do not reveal whether independent fragments really carry accessible, mutually consistent records of the same pointer variable. The missing evidence lives one level lower: in the raw, shot-indexed fragment records. The paper turns that gap into a reproducible benchmark. Starting from a fixed synthetic binary pointer-copy model with 100,000 shots and eight heterogeneous fragments, it asks what a raw-fragment evidence package should expose before redundancy, consensus, or Spectrum Broadcast Structure-style objectivity is inferred. The analysis enumerates all fragment subsets, separates mean-over-subsets and all-subsets threshold crossings, measures fragment disagreement, reproduces analytic binary-channel threshold maps, applies coupling-breaking negative controls, and stress-tests the result against hidden common-mode correlated errors. The resulting picture is sharper than an aggregate curve. In the baseline model, the 0.9 information-fraction threshold is crossed at subset size m=3 under the mean criterion, but only at m=4 under the stricter all-subsets criterion. Negative controls remain below threshold, while a hidden common-mode flip exposes the main fragility axis: many agreeing fragments can still fail as evidence for independent records if they share the same unobserved error source. The attached PDF gives the manuscript-level argument and results. The arXiv source package supports manuscript reproduction, and the ancillary benchmark archive contains the synthetic raw-shot data, subset diagnostics, disagreement tables, threshold maps, negative-control outputs, common-mode sensitivity maps, figures, scripts, manifests, and checksums. The scope is deliberately bounded. This is a synthetic/model-level benchmark and reproducibility package, not an experimental claim that Quantum Darwinism or Spectrum Broadcast Structure objectivity has been observed. Its purpose is to make explicit what future experimental raw-fragment evidence should provide before a plotted redundancy signature is treated as a claim of objective, independently accessible records.
Quantum Darwinism explains classical objectivity through the redundant spread of information across fragments of the environment. This note studies the opposite regime: an environment whose record is distributed through entangled correlations rather than independent fragments. The model considers a mediator carrying a which-branch displacement record while being purified by an unobserved environment. The central question is: how much of the original quantum information can an observer recover when only part of the environment is accessible? The paper proves that any fragment excluding the record-bearing mode contains exactly zero which-branch information. No individual fragment carries a readable record, and redundancy disappears completely. A closed-form partial-information curve is derived. The amount of accessible evidence depends only on the captured fraction of the environment purification and is governed by a single rational function. The curve connects two limits: the minimal information available to an external observer and the full information recovered when the complete environment is captured. A precise threshold is obtained: strong environmental entanglement requires capturing almost the entire environment before objectivity emerges. The results show that decoherence and objectivity are not equivalent. The same loss of coherence can either create a public, redundantly observable fact or leave information hidden entirely in nonlocal correlations. The structure of the environment determines whether quantum information becomes an objective classical fact or remains inaccessible. All results are derived in exactly solvable Gaussian models, verified analytically and numerically, and accompanied by a reproducibility package.
This paper examines the role of Quantum Darwinism in explaining the emergence of classical objectivity within The Many-Worlds Interpretation of quantum mechanics. Decoherence explains why macroscopically distinct alternatives become practically inaccessible to local observers, but it does not by itself explain why multiple observers can independently agree on the same classical state. Quantum Darwinism strengthens this account by describing how information about stable pointer states becomes redundantly encoded in environmental fragments. However, this paper argues that redundancy is necessary for objectivity but not enough to explain objectivity. A simple qubit test model implemented in Qiskit is used to demonstrate redundant environmental coding. The discussion connects this claim to Strong Quantum Darwinism, Spectrum Broadcast Structure, and Quantum Discord, which sharpen the distinction between mere correlation and objective classical records. Finally, this paper proposes phase anti-redundancy as a future direction; While pointer state information becomes locally redundant, cross-branch phase information appears to remain globally encoded and increasingly difficult to recover. This suggests that branch objectivity may require not only redundant classical records, but also the fact that cross-branch phase information is encoded in global correlations rather than in locally accessible environmental fragments.
This paper quantifies a structural exclusion principle in quantum decoherence dynamics: when environment fragments carry redundant classical records of a pointer observable, information about any conjugate observable (the frame variable) is forced into nonlocal, high-order correlations. The work fills a gap in the quantum Darwinism program (Zurek 2003, 2009), which has thoroughly characterized how pointer information is redundantly broadcast to environment fragments but has not provided a quantitative treatment—with explicit constants and tight bounds—of the complementary question: what happens to conjugate (phase/coherence) information as pointer redundancy increases. The central result is an exact complementarity law across every bipartition, demonstrating that pointer accessibility in the unobserved complement is precisely the resource that suppresses frame accessibility to a verifier. This identity is fully consistent with the no-hiding theorem (Braunstein and Pati 2007), which guarantees that frame information remains in principle recoverable from the environment; the contribution here is to quantify how the required coalition size scales with pointer redundancy according to an explicit exponential curve, establishing the resource cost of recovery that the no-hiding theorem leaves open. Key results include a quantitative redundancy–leakage tradeoff with explicit constants, a universal record-to-conjugate exclusion theorem valid for general pointer-preserving Stinespring isometries without product-branching or conditional-independence assumptions, and a formal cross-domain equivalence establishing that physical branching dynamics induce a ramp secret-sharing and data-hiding access structure for the frame bit. The secret-sharing structure connects to the quantum data hiding literature (DiVincenzo, Leung, and Terhal 2002; Eggeling and Werner 2002; Lami, Palazuelos, and Winter 2018), with the distinction that the hiding here is not artificially constructed but arises naturally from decoherence with redundant pointer records, parameterized by a single physically measurable quantity—the decoherence factor of the unobserved complement. The effective dephasing channel induced by fragment erasure has a structural analogy to the erasure channels studied in fault-tolerant quantum error correction, with pointer redundancy playing the role of an effective code distance for conjugate observables; the key difference from the QEC threshold setting is that the encoding is imposed by nature rather than designed, and the access structure may not be known a priori. The paper also complements information-theoretic equilibration approaches (Short and Farrelly 2012) and discord-based irreversibility arguments (Zurek 2018) by providing explicit coalition-size thresholds tied to physical parameters rather than generic typicality bounds or discord measures. The work formalizes the transition from quantum coherence to classical objectivity by elevating complementary information bounds to exact, model-independent structural identities, while acknowledging that the branching-family starting point inherits the system–environment partition assumed by the quantum Darwinism framework.
Abstract Classical objectivity arises when many independent observers can retrieve the same information about a quantum system without disturbing it. Quantum Darwinism (QD) explains this by treating the environment as a communication channel that redundantly broadcasts information about pointer observables. We develop an operational framework for quantifying this redundancy through the lens of functional information. By introducing a one-sided adequacy criterion based on the Holevo bound, we measure the \emph{abundance} of environment fragments that individually contain nearly all classically accessible pointer information. Using a heterogeneous pure–dephasing model, we sample fragments to extract onset statistics and apply isotonic regression to obtain stable estimates of redundancy and its functional-information counterpart FIQD=log⁡2RδFI_{QD}=\log_2 R_\deltaFIQD​=log2​Rδ​. The results reveal a generic onset–plateau structure: redundancy grows rapidly at early times, then saturates at a capacity-limited ceiling, universally across adequacy tolerances. We further connect FIQDFI_{QD}FIQD​ to thermodynamic bounds, showing that each additional bit of redundancy implies exponentially increasing minimal heat costs for record stabilization. This approach provides a conservative, model-agnostic measure of emergent classicality, suitable for both theoretical analysis and experimental probing.
A fact of the classical world is public property: many agents can learn it without erasing or revising it. Quantum mechanics offers no such notion, since unknown states cannot be copied and measurement disturbs. This review develops quantum Darwinism’s resolution, which locates classicality in the environment as a broadcast medium carrying independent records of an observable. The framework is assembled in information-theoretic terms: quantum mutual information between system and environment fragments, redundancy at an information deficit, the Holevo quantity separating accessible from total correlation, spectrum broadcast structure as the record-bearing state, and the quantum Chernoff information fixing the rate of accumulation. A proposition proving that spectrum broadcast structure forces the classical plateau fragment by fragment is given. Three media — spin registers, oscillator baths, and scattered photons — are examined, followed by account of a record’s life cycle: formation, degradation under intra-environmental scrambling and information backflow, and counterexamples where decoherence proceeds while no record is deposited. The relation between redundancy and consensus, consistent histories, laboratory evidence, and unresolved problems are treated in closing.
Quantum Darwinism (QD) and Spectrum Broadcast Structure (SBS) formalize a mechanism by which many observers can learn the same classical pointer value of a system by measuring different fragments of its environment. Most QD analyses treat the observer as idealized: unlimited access, perfect calibration, and no temporal constraints. This paper introduces an explicit observer quality parameterization and propagates it through redundancy and objectivity statements in a way that remains stable under an explicit ε-SBS trace-distance error model. Our main technical contributions are: (i) a decoder-level, tight (Chernoff-optimal) sample-complexity characterization for the number of environmental fragments needed to infer a pointer value under a calibrated observer model, (ii) a data-processing theorem showing that calibration noise (modeled as a CPTP channel) degrades the quantum Chernoff exponent, and (iii) an ε-robustness theorem upgrading ideal-SBS sample-complexity bounds to approximate-SBS states with additive error control. We ground the formalism in a fully worked open-system example: a central-spin pure-dephasing model whose conditional fragment states can be computed analytically, yielding explicit formulas for the observer parameters (R_O, C_O, τ_O) as functions of couplings, readout noise, and acquisition time. We also highlight a sharp performance gap between collective (coherent) decoding and product-measurement decoding for pure-state records, directly linking quantum memory horizon to redundancy. Finally, to connect this physics formalism to the DLN observer-quality framework, we introduce a three-state stage index q_O ∈ {q_D, q_L, q_N} mapping Dot/Linear/Network stages to memoryless, product, and collective decoding classes. We then prove three dynamical results about observer topology over time: (A) a dynamical redundancy theorem showing that the long-run effective Chernoff exponent depends on the observer's revision topology R_O, with full-cycle revision achieving the adaptive optimum while expand-only revision collapses permanently to the linear baseline; (B) an "inverted sophistication" theorem showing that an unmonitored collective decoder can be strictly worse than optimal product decoding below a critical coherence fraction; and (C) a pointer-accessibility proposition formalizing how the DLN stage determines which pointer distinctions are resolvable from a fixed fragment budget, providing an operational basis for observer-designed control of accessible quantum outcomes.