This paper examines the limits of quantum control from a structural perspective and explains why classical-style control strategies necessarily fail when applied to quantum phenomena. Despite major advances in experimental precision, noise suppression, feedback, and phase stabilization, direct control over individual quantum outcomes has not been achieved. We argue that this limitation is not technological but fundamental. Within a global realization framework, quantum outcomes do not arise from local physical processes evolving in space between emission and detection. Instead, they occur as discrete realization events constrained by the global experimental configuration. As a consequence, local dynamical interventions that leave the configuration unchanged cannot alter the probability distribution of outcomes. They can only improve the statistical estimation of that distribution. We formalize this limitation as a no-go result for classical-style quantum control: at fixed configuration, neither noise reduction, phase control, nor classical post-processing can steer quantum realizations. Control must therefore be redefined. Rather than selecting individual events, meaningful control operates by reshaping global realizability—enabling, suppressing, or excluding entire classes of outcomes through configuration-level manipulation. Minimal toy models are introduced to demonstrate how changes in experimental configuration modify realization admissibility without introducing signaling, determinism, or additional dynamics. The framework preserves quantum indeterminacy and standard no-go theorems while clarifying why many contemporary quantum control strategies stagnate. This work provides the control-theoretic extension of a broader global realization program, complementing earlier conceptual, modeling, and empirical studies. Quantum control, in this view, is architectural rather than dynamical: it consists in shaping the structure within which outcomes may occur, not in determining outcomes themselves.
This paper examines the limits of quantum control from a structural perspective and explains why classical-style control strategies necessarily fail when applied to quantum phenomena. Despite major advances in experimental precision, noise suppression, feedback, and phase stabilization, direct control over individual quantum outcomes has not been achieved. We argue that this limitation is not technological but fundamental. Within a global realization framework, quantum outcomes do not arise from local physical processes evolving in space between emission and detection. Instead, they occur as discrete realization events constrained by the global experimental configuration. As a consequence, local dynamical interventions that leave the configuration unchanged cannot alter the probability distribution of outcomes. They can only improve the statistical estimation of that distribution. We formalize this limitation as a no-go result for classical-style quantum control: at fixed configuration, neither noise reduction, phase control, nor classical post-processing can steer quantum realizations. Control must therefore be redefined. Rather than selecting individual events, meaningful control operates by reshaping global realizability—enabling, suppressing, or excluding entire classes of outcomes through configuration-level manipulation. Minimal toy models are introduced to demonstrate how changes in experimental configuration modify realization admissibility without introducing signaling, determinism, or additional dynamics. The framework preserves quantum indeterminacy and standard no-go theorems while clarifying why many contemporary quantum control strategies stagnate. This work provides the control-theoretic extension of a broader global realization program, complementing earlier conceptual, modeling, and empirical studies. Quantum control, in this view, is architectural rather than dynamical: it consists in shaping the structure within which outcomes may occur, not in determining outcomes themselves.
This work addresses the long-standing claim that interference phenomena—most notably in double-slit–type experiments—cannot be physically modeled without invoking wave propagation or particles following multiple trajectories. We show that this claim rests on an implicit restriction to local, dynamical descriptions acting between emission and detection. We introduce a minimal framework in which detection events are treated as discrete realizations occurring at an absorbing boundary, while the observed interference pattern arises from global structural admissibility constraints of the full experimental configuration. The model does not attempt to generate or predict individual detection events. Instead, it characterizes the statistical distribution of outcomes as a property of realization closure rather than of local evolution in transit. Within this approach, interference patterns are understood as emergent statistical signatures of global realization structure, not as evidence of propagating waves, hidden variables, or oscillatory dynamics in space. The framework preserves all empirical features of standard interference experiments while avoiding assumptions about intermediate physical processes that are neither observed nor required by theory. This work is consistent with relativistic and quantum no-go results concerning photon trajectories, localization, and in-flight observables. It complements earlier structural interpretations of light and realization by providing a concrete, physically explicit model demonstrating how stable interference statistics arise without propagation. The contribution clarifies the precise sense in which interference is modelable, and the sense in which it is not: individual events remain intrinsically unpredictable, while their global organization is physically intelligible at the level of realization structure. The model introduces no new forces, fields, or modifications of established equations, and is intended as a refinement of conceptual foundations rather than a replacement of existing formalisms.
This work analyzes single-quantum interference experiments from a strictly empirical perspective, focusing on the observable structure of detection patterns rather than on interpretational assumptions. Across more than a century of increasingly refined experiments, interference patterns exhibit a distinctive and robust combination of features: detection events are discrete and intrinsically unpredictable, yet their accumulated distribution converges rapidly to a stable, sharply structured pattern determined solely by the global experimental configuration. We show that these empirical properties impose strong constraints on admissible physical models. In particular, the sharpness, stability, and configuration-locked nature of interference minima are incompatible with explanations based on strictly local propagational mechanisms acting in transit between emission and detection. Local dynamical processes generically entail empirical signatures—such as intermediate observables, history dependence, noise-induced degradation of minima, or gradual pattern formation—that are systematically absent in interference data. By contrasting single-quantum interference experiments with genuine propagation measurements, where intermediate fields or particle properties are in principle accessible, we demonstrate that interference belongs to a different empirical category. What is observed is not the trace of a process evolving through space, but the spatial organization of discrete realization events at an absorbing boundary, governed by global structural constraints. The analysis does not introduce new experimental predictions at the level of local quantum measurements. Instead, it establishes that the empirical character of interference patterns itself necessitates a global, non-propagational modeling framework. Interference is therefore not merely compatible with such descriptions, but empirically excludes strictly local dynamical accounts. This work provides the empirical pillar of a broader global realization program, complementing prior conceptual and modeling studies.
This paper develops the structural modeling core of a global realization approach to quantum interference. Building on prior work that established the possibility of non-propagational descriptions, the present study addresses a more precise question: how quantum interference can be explicitly modeled once local propagation, trajectories, and in-transit dynamics are excluded. The model introduces realization admissibility functionals defined over the complete experimental configuration, including source, apertures, and absorbing boundaries. These functionals are non-dynamical and non-ontic; they do not represent physical fields or evolving states, but encode global compatibility conditions that govern where detection events can coherently close. Detection probabilities emerge through statistical closure at the absorbing boundary, reproducing standard interference patterns without invoking wave superposition in space. A minimal geometric formulation is presented to demonstrate how slit configurations generate admissibility structures that yield conventional interference statistics. Within this framework, interference minima arise naturally as forbidden realizations rather than as products of destructive interaction between propagating entities. The model preserves full empirical equivalence with standard quantum mechanics while clarifying the physical status of interference as an organizational, rather than dynamical, phenomenon. This work does not modify quantum dynamics or introduce additional degrees of freedom. Its contribution is structural: it sharpens the distinction between quantum dynamical states and realization, delineates the limits of local modeling, and provides a concrete, explicit framework for modeling interference at the level where empirical outcomes occur. The paper serves as the modeling core of a broader global realization program, situated between conceptual foundations and empirical analysis.
This preprint is part of a three-paper series exploring physical realization as a temporally organized process constrained by relativistic causality. The present paper addresses quantum outcome realization. Standard quantum mechanics provides a complete and accurate description of state evolution but does not specify how physical outcomes are realized within an already structured world. In this work, a strict separation is made between quantum dynamics and realization. No modification of the Schrödinger equation, operators, or measurement formalism is introduced. A minimal global temporal constraint, T= L / c, is proposed as an organizational condition on realization, arising directly from finite causal connectivity. Quantum states are interpreted as spaces of possible realizations, while actual outcomes emerge through selection constrained by global phase compatibility with previously realized structure. Within this framework, the Born rule appears as the unique statistically stable distribution of realizations required for consistency across composite systems, rather than as a postulate of dynamics. The approach preserves quantum indeterminacy, introduces no hidden variables, and provides a unified account of realization across quantum and macroscopic regimes.
Modern physics provides empirically complete and highly successful descriptions of local dynamics. General relativity specifies the causal evolution of spacetime geometry, and quantum mechanics specifies the unitary evolution of states. Despite this success, both frameworks leave implicit a foundational question: when a dynamically admissible configuration can be regarded as physically realized as part of a coherent world. This work introduces a minimal, non-dynamical realization criterion that formally closes this gap. Physical realization is defined as a global, temporally organized admissibility condition constrained by relativistic causality. The criterion does not modify any local equations of motion, introduce new forces, fields, particles, or degrees of freedom, nor alter the mathematical structure of existing theories. Instead, it identifies realization as an organizational condition required for dynamical solutions to become physically instantiated. A minimal causal bound T = L / c is shown to follow directly from relativistic causal structure, implying a finite organizational time for global coherence across a spatial extent L. The associated inverse scale Ω = c / L is clarified as a structural constant rather than a dynamical frequency: it has no oscillatory interpretation, carries no energy, and does not represent a physical process. Its role is purely limiting—it marks the minimal global temporal orientation required for realization to persist. Within this framework, classical gravitational optics, delayed global geometric organization, and quantum outcome realization arise as direct consequences of the same realization criterion. The contribution of this work is exclusively structural: it makes explicit a condition already implicit in successful physical theories and provides a formal closure without extending or revising their dynamics. This paper concludes a broader research program on temporal realization, gravitational organization, and global coherence by isolating realization as a necessary condition for physics to describe a world at all.
The standard measurement postulate of quantum mechanics stipulates an instantaneous, non-local update of the global wavefunction upon measurement of an entangled subsystem. This postulate has been a persistent source of foundational tension, both with the locality structure of relativistic physics and with the dynamical character of the decoherence program. We separate the measurement postulate into three logically independent claims: definite outcome realization, Born-rule probability assignment, and instantaneous projection for the global wavefunction. We argue that the third claim can be eliminated at the axiomatic level and propose a modified measurement postulate, Postulate M, that replaces it. Under Postulate M, a single pointer outcome is realized locally when environmental decoherence has einselected a pointer basis at the measurement site; the corresponding selection acts on the global wavefunction as a conditional restriction to a branch rather than as a physical operation on spacelike-separated regions. We show that Postulate M recovers the standard measurement postulate as a limiting idealization for vanishing decoherence time, derives Lüders’ rule for sequential measurements, and yields no-signaling as an automatic structural consequence — not only at the level of measurement statistics but at the level of physical states themselves. Two explicit illustrations in the EPR scenario — with one and with both particles coupled to local spin environments — demonstrate the framework concretely and exhibit its frame-independent, manifestly local character. The framework is built on standard decoherence theory, compatible with multiple candidate mechanisms for single-outcome realization including gravitationally-induced collapse proposals, and naturally situated within a ψ-ontic reading of the quantum state. It represents, we argue, a reformulation of quantum mechanics as a local, state-realist theory — preserving Einstein’s aspiration for an objective physical world in the only form consistent with the empirical content of quantum mechanics, namely realism about the wavefunction rather than about pre-measurement observable values.