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Education Sciences

Beyond “Duality”: A Counterfactual Model-Testing Perspective on Interpretative Schemes in the Single-Quantum Double-Slit Experiment

Marco Giliberti, Luisa Lovisetti

Published Oct 17, 2026• 0 citations
Publisher

Abstract

The single-quantum double-slit experiment is often taught through a compact narrative of localised detections, interference, and wave–particle duality that may conceal weak explanatory coordination. This qualitative-dominant mixed-methods study investigates how students and teachers distinguish description of the experimental outcome from recognition of its interpretative problem. The framework uses counterfactual model testing as an analytical lens for examining model–evidence coordination, together with epistemic framing, ontological flexibility, and multimodal representation. The study draws on 54 individually coded questionnaires from the “100 QM” course and six follow-up interviews. In this corpus, 48 participants (88.9%) adequately described the double-slit outcome, whereas 26 (48.1%) also articulated, in response to the questionnaire prompts, a specific explanatory tension or unresolved relation concerning the experimental outcome. Recurrent explanations invoked definite trajectories, literal wave–particle transformations, physicalised probability waves, appeals to self-interference, and anthropocentric observation. The findings indicate that descriptive familiarity and technical terminology do not by themselves ensure interpretative recognition. These findings reinforce the distinction between descriptive familiarity and interpretative understanding, showing that understanding the double-slit experiment involves not only descriptive adequacy, but also the recognition and examination of the explanatory tensions that emerge when proposed models are compared with the experimental evidence.

DOI
10.3390/educsci16101739

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The single-quantum double-slit experiment is often taught through a compact narrative of localised detections, interference, and wave–particle duality that may conceal weak explanatory coordination. This qualitative-dominant mixed-methods study investigates how students and teachers distinguish description of the experimental outcome from recognition of its interpretative problem. The framework uses counterfactual model testing as an analytical lens for examining model–evidence coordination, together with epistemic framing, ontological flexibility, and multimodal representation. The study draws on 54 individually coded questionnaires from the “100 QM” course and six follow-up interviews. In this corpus, 48 participants (88.9%) adequately described the double-slit outcome, whereas 26 (48.1%) also articulated, in response to the questionnaire prompts, a specific explanatory tension or unresolved relation concerning the experimental outcome. Recurrent explanations invoked definite trajectories, literal wave–particle transformations, physicalised probability waves, appeals to self-interference, and anthropocentric observation. The findings indicate that descriptive familiarity and technical terminology do not by themselves ensure interpretative recognition. These findings reinforce the distinction between descriptive familiarity and interpretative understanding, showing that understanding the double-slit experiment involves not only descriptive adequacy, but also the recognition and examination of the explanatory tensions that emerge when proposed models are compared with the experimental evidence.
This article examines the double-slit experiment from a configurational perspective and compares it with the standard quantum-mechanical, Bohmian, and Many-Worlds interpretations. Rather than focusing on microscopic trajectories or wavefunction collapse, the work argues that the central question posed by the experiment is not “how” individual particles behave, but “why” a stable interference pattern emerges with overwhelming statistical certainty. By framing the experiment in terms of constrained configuration spaces and typicality, the article shows that interference can be understood as an inevitable macroscopic outcome, not a mysterious dynamical process.
This research challenges the conventional interpretation of the renowned double-slit experiment by experimentally scrutinizing and incorporating an innovative approach of using Lithium Niobate as a detector. If successful, the outcomes could disrupt existing theories and inspire new interpretations. The potential ramifications extend to ground- breaking revolutions in quantum understanding, technological applications, and the contribution to the field of physics, potentially transforming our understanding of quantum mechanics and its foundational principles. The experiment seeks to provide experimental evidence regarding the behavior of quantum particles in the presence of detectors at the slits, addressing a longstanding loophole in quantum mechanics. By examining whether the interference patterns persists when particle paths are measured, the study aims to redefine the Complementarity Principle and offer new insights into wave-particle duality as well as the observer effect. This paper not only addresses a major loophole in quantum mechanics but also holds the promise of shaping the future landscape of quantum exploration and understanding.
We present a computational demonstration that the apparent wave-particle duality inthe double-slit experiment emerges naturally from the quotient structure connecting two observerbundles: the quantum-coherent bundle OQM (which perceives interference patternsand superposition) and the measurement bundle OMeas (which perceives discrete detectionevents). Through numerical simulations, we show that individual detection eventsappear random and particle-like while statistical accumulation reveals the underlying wavepattern—without invoking wave function collapse. Crucially, this analysis adopts the epistemic structuralism of Scale-Relative DistinguishabilityTheory (SRDT): we make no claims about the intrinsic nature of fundamental dynamicsF. The wave function ψ(x, t) is what OQM perceives; discrete detections are whatOMeas perceives. Both are quotients of F, denoted F/∼O. Asking “is the electron reallya wave or a particle?” is asking about F’s intrinsic nature—a question that lies beyondembedded-observer access. Our simulations validate the quotient structure quantitatively: pattern visibility metricsshow smooth transitions from particle-like to wave-like statistics as detection number Nincreases, with correlation coefficients exceeding 0.99 between simulated and theoreticaldistributions. We derive testable predictions for the critical detection number Ncritical ∝(δx)2 as a function of detector resolution. We further demonstrate that the double-slit experiment instantiates universal SRDTpatterns appearing across multiple physics transforms: wave-particle duality dissolves asobserver-relative descriptions of an F-unity, and the wave-to-particle transition is structurallyisomorphic to the Wave Optics → Geometrical Optics transform. The question“which slit did the photon go through?” is shown to be a category error analogous to askingfor the temperature of a specific microstate.
Abstract The double-slit experiment is a classic experiment that presents the clearest manifestation of wave-particle duality, one of the fundamental principles of quantum mechanics. The double-slit experiment still remains the phenomenon that demonstrates wave-particle duality at the most fundamental level. This phenomenon quantitatively and conceptually demonstrates that microscopic objects can behave like both waves and particles at the same time. This article provides an in-depth analysis of the physical nature of dualism, the mechanism of formation of the interference pattern, and the impact of the act of observation on the dynamics of quantum systems. The need for a new perspective on this topic is due to the fact that the current uncertainty in the interpretation of quantum reality has not yet been completely eliminated, and the boundaries between classical and quantum behavior in microscopic objects are still being explored. The results presented here restructure the deep mechanisms of the interference picture, more clearly frame the relationship between observation and wavefunction collapse, and provide a quantum. Since the article attempts to provide a complete answer to the mechanism of the formation of wave-particle duality, extensive space is given to sections such as historical development, theoretical models, modern research, etc. New approaches to this phenomenon have been developed using modern research and string theory. As a result, a new mathematical expression has been proposed that explains the reasons for the initial emergence of wave-particle duality, and is also important for string theory. The article explains the measurement problem with a more effective physical structure and ontological model.
Quantum mechanics is considered conceptually to be a demanding topic due to the classically counterintuitive nature of its basic concepts and entities. A study is carried out where a picture of students' conceptual understanding of quantum entities (quantum `particles') is constructed. This is done by analysing students' qualitative problem solving. The problem used as a research tool in this study is based on an example of the gradual formation of interference pattern for either low intensity light or electron beam passing through a two-slit system. It is suggested that students' conceptions can be described with four distinct models of `description categories', which are (a) quasi-classical (particle ontology based), (b) trajectory based, (c) statistical (probabilistic) and (d) quasi-quantum models. In most cases the responses are dominated by classical pictures and trajectory based reasoning, described by categories (a) and (b). In just a few cases, the responses give evidence of the formation of new quantum ontology. In these cases, the students' responses can be described adequately by a combination of categories (c) and (d).
Abstract In the past there has been great faith in the power of laboratory activities and teacher demonstrations to enhance the learning of physics concepts. However, reviews of the effectiveness turned out to be disappointing [1-3] and have shown that lab activities and demonstrations need to be carefully designed and embedded in lessons to realize cognitive benefits [4]. Nevertheless, for secondary school quantum physics we developed a portable double slit demonstration mounted in a suitcase in which photons pass the slits approximately one by one and yet together produce an interference pattern. Based on experiences in 5 schools, we carefully designed the educational aspects of the demonstration and investigated its longterm learning effects through a written test of 68 students after 4 weeks and retention interviews after 4 months (10 interviews) and after 9 months (5 interviews). Students did remember the setup and results of the demonstration quite well. They were quite aware of the unexpected and strange wave-particle behavior of quantum particles in the demonstration including the effect of measurement or observation on the outcomes. However, half of them still had trouble defining duality in their own words and most of them did not remember de Broglie particle waves and how that related to the double slit experiment.