Bell inequalities normally ask what correlations are possible once the available measurements have been chosen. This paper asks an earlier question: what determines which measurements are available in the first place? The proposed framework uses the Dirac operator of noncommutative geometry to assign a geometric cost to each dichotomic observable. A measurement is available only when its cost is within the apparatus budget. This restriction can create a sharp threshold: below it, the maximum CHSH value remains exactly classical, while above it, Bell violation becomes possible. The way the violation emerges reflects the local geometry around the least costly nonclassical measurements. The paper develops this threshold theory, examines the symmetry imposed by Connes’ real structure, studies the role of different observable components, and supports the analytical results with independent numerical verification and exact-arithmetic threshold certificates.
Bell inequalities normally ask what correlations are possible once the available measurements have been chosen. This paper asks an earlier question: what determines which measurements are available in the first place? The proposed framework uses the Dirac operator of noncommutative geometry to assign a geometric cost to each dichotomic observable. A measurement is available only when its cost is within the apparatus budget. This restriction can create a sharp threshold: below it, the maximum CHSH value remains exactly classical, while above it, Bell violation becomes possible. The way the violation emerges reflects the local geometry around the least costly nonclassical measurements. The paper develops this threshold theory, examines the symmetry imposed by Connes’ real structure, studies the role of different observable components, and supports the analytical results with independent numerical verification and exact-arithmetic threshold certificates.
We derive the Bell–CHSH inequality as a conditional theorem inside Charlton Geometry (CG), rather than as an independent axiom about “local realism”. The key CG primitive is non-invertibility, η(ω) = η(−ω), which forces an observational quotient and produces irrecoverable “lost state” carried by polarity and intrinsic phase. In a bipartite experiment, Bell’s bound is recovered exactly when one adds an additional factorization condition asserting that outcomes depend only on local settings and a local lift choice, i.e. that the lost-state fiber decomposes into independent local fibers. Within CG, the natural geometric coupling of two regions through shared lift and holonomy generically violates that factorization while preserving operational no-signaling, so the Bell inequality becomes a theorem about a restricted subclass of quotients rather than a universal constraint. Using the Born brick as an upstream theorem that fixes the unique binary law cos2(θ/2) on the spin-lifted setting space, we recover the standard singlet correlation E(a, b) = −a °§ b and the Tsirelson bound 2√2 as the sharp CG-compatible CHSH maximum. In this framing, Bell violation is not an ontic miracle but the expected signature of a globally shared, non-invertible geometric substate whose reversal cannot be represented
Bell’s theorem is a foundational result in quantum theory, demonstrating that no local hidden-variable model satisfying certain assumptions can reproduce quantum correlations. While mathematically correct within its formal framework, the theorem implicitly relies on a specific representational choice: measurement outcomes are modeled as scalar, commutative variables (±1). This assumption, though natural for flat and static configurations, is not mandated by physical necessity. In this work, we examine the consequences of relaxing this representational constraint when measurement outcomes arise as projections of states with nontrivial topology. We show that when physical correlations are naturally organized as elements of an S³-valued structure — such as those associated with spin and rotational degrees of freedom — the induced measurement algebra becomes noncommutative. Under these conditions, the key algebraic factorizations employed in Bell-type derivations no longer apply. We construct an explicit local, realistic model in which observable correlations reproduce the quantum expectation E(a, b) = − cos θ and violate the CHSH bound S ≤ 2, without invoking non-local interactions or superluminal influences. The effective S³×I structure arises not as a fundamental substrate, but as the natural geometric form taken by the actualization of physical processes within an underlying relational framework. Importantly, this structure was not introduced to address quantum entanglement specifically; it emerged independently in the study of cosmological expansion, emergent gravity, and mass generation. Its relevance to Bell-type correlations follows as a consequence of geometry, not as an ad hoc modification. These results suggest that quantum entanglement may reflect topological features of physical realization rather than intrinsic non-locality. Possible experimental implications and connections to geometric and substrate-based approaches to fundamental physics
We derive the Bell–CHSH inequality as a conditional theorem inside Charlton Geometry (CG), rather than as an independent axiom about “local realism”. The key CG primitive is non-invertibility, η(ω) = η(−ω), which forces an observational quotient and produces irrecoverable “lost state” carried by polarity and intrinsic phase. In a bipartite experiment, Bell’s bound is recovered exactly when one adds an additional factorization condition asserting that outcomes depend only on local settings and a local lift choice, i.e. that the lost-state fiber decomposes into independent local fibers. Within CG, the natural geometric coupling of two regions through shared lift and holonomy generically violates that factorization while preserving operational no-signaling, so the Bell inequality becomes a theorem about a restricted subclass of quotients rather than a universal constraint. Using the Born brick as an upstream theorem that fixes the unique binary law cos2(θ/2) on the spin-lifted setting space, we recover the standard singlet correlation E(a, b) = −a °§ b and the Tsirelson bound 2√2 as the sharp CG-compatible CHSH maximum. In this framing, Bell violation is not an ontic miracle but the expected signature of a globally shared, non-invertible geometric substate whose reversal cannot be represented Original DOI: 10.5281/zenodo.18216032 Version: 0.9.0
Many solid-state quantum platforms do not permit sharp, projective measurements but instead yield continuous voltage or field traces under weak, non-demolition readout. In such systems, standard Bell tests based on dichotomic projective measurements are not directly applicable, raising the question of how quantum nonlocality can be certified from continuous time-series data. Here we develop a general theoretical framework showing that Bell-CHSH inequality violation can be extracted from continuous, non-projective measurements without assuming any specific collapse model or phase distribution. We show that sufficiently long continuous measurements of a single entangled pair sample its internal phase-probability structure, enabling effective dichotomic observables to be constructed through phase-sensitive projections and coarse-graining. The resulting Bell correlator is governed by two experimentally accessible resources: intrinsic single-qubit phase spread and nonlocal phase locking between qubits. We benchmark the resulting estimator against conventional projective-measurement CHSH tests implemented via quantum-circuit simulations using Qiskit, finding quantitative agreement in the Bell-violating regime without parameter fitting. Classical deterministic correlations cannot violate the CHSH bound, whereas quantum phase-locked systems recover the nonlinear angular dependence characteristic of entanglement. Our results provide a practical route to demonstrating Bell nonlocality in platforms where measurements are inherently continuous and weak.
It is one of the most remarkable features of quantum physics that measurements on spatially separated systems cannot always be described by a locally causal theory. In such a theory, the outcomes of local measurements are determined in advance solely by some unknown (or hidden) variables and the choice of local measurements. Correlations that are allowed within the framework of a locally causal theory are termed classical. Typically, the fact that quantum mechanics does not always result in classical correlations is revealed by the violation of Bell inequalities, which are constraints that have to be satisfied by any classical correlations. It has been known for a long time that entanglement is necessary to demonstrate nonclassical correlations, and hence a Bell inequality violation. However, since some entangled quantum states are known to admit explicit locally causal models, the exact role of entanglement in Bell inequality violation has remained obscure. This thesis provides both a comprehensive review on these issues as well as a report on new discoveries made to clarify the relationship between entanglement and Bell inequality violation. In particular, within the framework of a standard Bell experiment, i.e., a Bell inequality test that is directly performed on a single copy of a quantum state r, we have derived two algorithms to determine, respectively, a lower bound and an upper bound on the strength of correlations that r can offer for any given Bell inequality. Both of these algorithms make use convex optimization techniques in the form of a semidefinite program. By examples, we show that these algorithms can often be used in tandem, in conjunction with convexity arguments, to determine if a quantum state can offer nonclassical correlations and hence violates a given Bell inequality. On the other hand, since a standard Bell experiment typically involves measurements over many copies of the quantum systems, we have also investigated the possibility of enhancing the strength of nonclassical correlation by, instead, performing collective measurements on multiple copies of the quantum systems. Our findings show that even without postselection, such joint measurements may also lead to stronger nonclassical correlations, and hence a better Bell inequality violation. Meanwhile, previous studies have indicated that entangled state admitting locally causal models may still lead to observable nonclassical correlations if, prior to a standard Bell experiment, the state is subjected to some appropriate local preprocessing. This phenomenon of hidden nonlocality was discovered more than a decade ago, but to date, it is still not known if all entangled states can demonstrate nonclassical correlations through these more sophisticated Bell experiments. A key result in this thesis then consists of showing that for all bipartite entangled states, observable nonclassical correlations, in the form of a Bell-CHSH inequality violation, can indeed be derived if we allow both local preprocessing and the usage of shared ancillary state which by itself does not violate the Bell-CHSH inequality. This establishes a kind of equivalence between bipartite entanglement and states that cannot be simulated by classical correlations. In summary, for a standard Bell experiment where no local preprocessing on a quantum state r is allowed, we have provided two algorithms that can be used in tandem to determine if r can be simulated by a locally causal theory, whereas in the scenario where local preprocessing is allowed, we have demonstrated that bipartite entangled states are precisely those which cannot always be simulated classically.
Abstract We present a unified analysis showing that the dominant numerical and qualitative structure of Bell–CHSH correlations—including the ubiquitous appearance of √2, sinusoidal correlation curves, and violations of the CHSH bound—arises generically from Euclidean projection plus measurement-induced dimensional reduction. The argument is developed in three interlocking layers. A geometry-first layer uses macroscopic analogues (tuned guitar strings with threshold detectors) to make the projection mechanism inspectable: a shared relational state, local measurement axes, and a recording map that collapses continuous amplitudes to binary outcomes. A threshold-scan (“dial”) test shows that conditioned CHSH values rise smoothly above 2 as the acceptance criterion tightens. A Fourier-analytic layer demonstrates that the sign function—the operator that converts continuous amplitudes to ±1—injects an infinite series of odd harmonics into a pure fundamental signal. The classical triangle-wave correlation E(θ) = 2θ/π − 1 is the fundamental plus harmonic distortion; the quantum correlation E(θ) = −cos θ shares the same fundamental mode but without higher-harmonic content and with unit amplitude. A detection threshold acts as a conditioning map that progressively strips the distortion harmonics. At threshold τ ≈ 0.23, total harmonic distortion reaches near zero, the correlation matches −cos θ, and |S| = 2√2. A combinatorial layer introduces the Q/R/x ontological framework—where Q is the object, R the definite binary relationship, and x the genuinely ambiguous state—and connects it to the formula (n2 − n)/2. Binary measurement (n = 2) supports 1 pairwise relationship and a linear correlation. Acknowledging x as a third state (n = 3) yields 3 pairs—exactly the minimum for planar angular geometry and the cosine. These three layers converge: the gap between |S| = 2 and |S| = 2√2 is the total harmonic distortion introduced by binary quantisation of a continuous angular signal—equivalently, the information-theoretic cost of projecting a ternary relational reality onto a binary measurement space. We show that the hard-threshold model produces CHSH violations only through post-selection on coincidences; when no-detection events are properly accounted for, the model respects all Bell-type inequalities, including the Eberhard/CH inequality used in modern “loophole-free” experiments. This honestly limits the model’s scope but sharpens the open question: whether the trial-definition process upstream of the detectors (heralding, phase-matching) constitutes a form of selection beyond the hard threshold that could affect 1 full-accounting statistics. We propose the “dial test”—sweeping acceptance criteria and plotting violation strength versus acceptance fraction—as a concrete, falsifiable protocol for probing ensemble neutrality in any Bell experiment. Nothing in this work challenges the empirical validity of quantum mechanics or the logical structure of Bell’s theorem. Rather, it challenges the necessity of interpreting Bell-type correlations as evidence for an ontological division of reality into “quantum” and “classical” domains. The analysis suggests that what distinguishes the so-called quantum regime is not a change in physical law, but a change in how much of the underlying relational structure survives measurement and recording. If this reading is correct, its most consequential implication is that the correlations which motivated the inference of “action at a distance” have a local geometric origin: they are properties of a shared state established in the past, not signals transmitted in the present, and their statistical character is determined by how severely the observation compresses what was already there.