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Physical Distortion of Equivalent Slit Model Using Single Atomic Scattering

Jiaqing Yan

Published Jul 25, 2026• 0 citations
Publisher

Abstract

Published in 2025, the recoiling-slit quantum interference experiment employs optically trapped single rubidium atoms to scatter photons. It claims to physically realize Einstein’s thought experiment of a movable physical slit and supports the principle of quantum complementarity based on experimental observations. Within the framework of the Original Light Theory, this paper strictly distinguishes the microscopic motion of individual photons and the statistical characteristics of photon ensembles. From the perspectives of acting environment, spatial scale and microscopic coupling mechanism, we demonstrate that the single rubidium atom scattering system only shares approximate mathematical appearances with the traditional double-slit system with physical wall thickness, while their physical essences are entirely different. This experiment artificially eliminates core physical conditions in real double-slit systems, including photon oscillation, slit channels and continuous momentum coupling between photons and slit walls, which constitutes typical conceptual substitution. Fundamentally, it is merely a recoil scattering experiment between single photons and isolated rubidium atoms, and cannot be equated with physical double-slit interference experiments. Once the inherent oscillation of photons and the mechanism of continuous interaction between photons and thick slit walls are incorporated, there is no basis for the equivalence of the two sets of models. Asserting model equivalence while ignoring photon oscillation and slit-wall coupling effects is nothing but self-deception. Its experimental conclusions are highly misleading. They cannot be extended to interpret real thick-wall double-slit interference and cannot serve as reliable experimental evidence for the validity of the principle of complementarity. Previous theoretical analyses built on physical slit models remain fully valid. Divergences originate from the replacement of experimental physical models rather than defects in the original physical mechanism analysis.

DOI
10.5281/zenodo.21559723

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Published in 2025, the recoiling-slit quantum interference experiment employs optically trapped single rubidium atoms to scatter photons. It claims to physically realize Einstein’s thought experiment of a movable physical slit and supports the principle of quantum complementarity based on experimental observations. Within the framework of the Original Light Theory, this paper strictly distinguishes the microscopic motion of individual photons and the statistical characteristics of photon ensembles. From the perspectives of acting environment, spatial scale and microscopic coupling mechanism, we demonstrate that the single rubidium atom scattering system only shares approximate mathematical appearances with the traditional double-slit system with physical wall thickness, while their physical essences are entirely different. This experiment artificially eliminates core physical conditions in real double-slit systems, including photon oscillation, slit channels and continuous momentum coupling between photons and slit walls, which constitutes typical conceptual substitution. Fundamentally, it is merely a recoil scattering experiment between single photons and isolated rubidium atoms, and cannot be equated with physical double-slit interference experiments. Once the inherent oscillation of photons and the mechanism of continuous interaction between photons and thick slit walls are incorporated, there is no basis for the equivalence of the two sets of models. Asserting model equivalence while ignoring photon oscillation and slit-wall coupling effects is nothing but self-deception. Its experimental conclusions are highly misleading. They cannot be extended to interpret real thick-wall double-slit interference and cannot serve as reliable experimental evidence for the validity of the principle of complementarity. Previous theoretical analyses built on physical slit models remain fully valid. Divergences originate from the replacement of experimental physical models rather than defects in the original physical mechanism analysis.
In December 2025, Pan Jianwei’s research team reproduced the Einstein-Bohr recoiling-slit thought experiment proposed in 1927 at the quantum limit. They observed that the interference fringe contrast changes continuously with the momentum of the slit. Mainstream physical theories currently regard this phenomenon as critical evidence for the quantum complementarity principle. Based on the Light Primitive Theory, this paper points out that all relevant theoretical models established since the century-long debate at the Solvay Conference contain two fundamental idealized simplifications: first, physical slits are abstracted as two-dimensional geometric holes with zero thickness; second, the inherent continuous spatial oscillation of photons is ignored. Photons are not point-like particles moving along fixed straight lines. Their persistent oscillation enables continuous momentum coupling between photons and the photon self-locked matter forming the slit walls throughout the whole passage through the physically thick slit channel. The inverse correlation between path detectability and interference fringe visibility observed in the experiment can be self-consistently explained by continuous photon-slit wall interaction, without abstract hypotheses such as wave-particle complementarity or quantum superposition. This paper supplements the objective physical conditions missing from traditional models and provides a brand-new interpretative framework for quantum interference phenomena at the underlying mechanism level.
A model of the Einstein–Bohr recoiling slit experiment is formulated in a fully quantum theoretical setting. In this model, the state and dynamics of a movable wall that has two slits in it, as well as the state of a particle incoming to the two slits, are described by quantum mechanics. Using this model, we analyzed complementarity between exhibiting an interference pattern and distinguishing the particle path. Comparing the Kennard–Robertson type and the Ozawa-type uncertainty relations, we conclude that the uncertainty relation involved in the double-slit experiment is not the Ozawa-type uncertainty relation but the Kennard-type uncertainty relation of the position and the momentum of the double-slit wall. A possible experiment to test the complementarity relation is suggested. It is also argued that various phenomena which occur at the interface of a quantum system and a classical system, including distinguishability, interference, decoherence, quantum eraser, and weak value, can be understood as aspects of entanglement. Quanta 2015; 4: 1–9.
The double-slit interference experiment serves as a fundamental experiment in quantum mechanics. Core theories including wave-particle duality, quantum superposition and measurement collapse are established on the basis of this phenomenon. The mainstream Copenhagen interpretation and Bohmian pilot-wave theory rely heavily on mathematical statistical fitting to interpret experimental outcomes, yet they fail to reveal the real physical evolution mechanism of photons at the microscale. Moreover, they inherently suffer from symmetry breaking, causal discontinuity and logical inconsistency. The symmetry-breaking analogy widely adopted in academic circles contains dimensional mismatch and conceptual substitution, representing a cognitive bias that places mathematical tools above physical mechanisms. Based on the symmetry principle of classical physics and the rule of continuous causal evolution, this paper systematically identifies the core defects of mainstream quantum interpretations and points out the paradigm limitation of quantum mechanics that prioritizes mathematical fitting over physical ontology. A spatial particle resonance propagation model is proposed. This model explains that photons are essentially the resonance manifestation of space particles. When resonance passes through double slits, the resonance body splits symmetrically, and then recombines after passing through the slits to form interference. Measurement will break the symmetry of resonance, resulting in the disappearance of interference fringes. This model maintains continuous causality and geometric symmetry, and provides a new physical mechanism explanation for quantum uncertainty and measurement effects in double-slit experiments.
Traditional quantum mechanics explains single-slit diffraction and double-slit interference using wave–particle duality, claiming that photons exhibit both particle and wave properties and can produce self-interference to form light–dark patterns. This paper proposes a new theory: photons always move in uniform linear motion, accompanied by 360° omnidirectional, random, uncontrollable microscopic tremor during propagation. The patterns observed in single-slit and double-slit experiments are macroscopic phenomena formed by collision, reflection, and angular deflection of photons with slit walls due to their inherent tremor, followed by geometric amplification and statistical superposition of numerous photon trajectories. No patterns appear without a baffle because photons do not collide with any wall; no patterns appear with an overly wide slit because photons still pass through without touching the walls. Patterns emerge only when the slit is narrow enough to cause photon–wall collisions. When photons collide with atoms on the slit walls, electrons undergo energy level transitions and emit secondary light; superposition of secondary light from different directions forms alternating bright and dark fringes. This paper designs a carbon nanotube light-absorbing/non-absorbing control experiment and a receiver backplate distance variation auxiliary experiment, both of which provide quantitative and measurable evidence for the theory and form a complete logical closed loop, indicating that the wave–particle duality interpretation is untenable.
Young's double slit experiment has often been used to illustrate the concept of complementarity in quantum mechanics. If information can in principle be obtained about the path of the photon, then the visibility of the interference fringes is reduced or even destroyed. This Gedanken experiment discussed by Bohr and Einstein can be realized when the slit is replaced by individual atoms sensitive to the transferred recoil momentum of a photon which "passes through the slit". Early pioneering experiments were done with trapped ions and atom pairs created via photo-dissociation. Recently, it became possible to perform interference experiments with single neutral atoms cooled to the absolute ground state of a harmonic oscillator potential. The slits are now single atoms representing a two-level system, and the excitation in the harmonic oscillator potential is the which-way marker. In this note, we analyze and generalize two recent experiments performed with single atoms and emphasize the different ways they record which-way information.
In 1927, during the fifth Solvay Conference, Einstein and Bohr described a double-slit interferometer with a "movable slit" that can detect the momentum recoil of one photon. Their debate centered on this Gedankenexperiment has provided profound insights into the central concepts of quantum mechanics. Despite many efforts to reproduce this conceptual experiment, a linear-optical version with a movable, quantum-limited slit and tunable momentum width remained challenging. Here, we report a realization of the Einstein-Bohr interferometer using a single atom in an optical tweezer, which is cooled to the motional ground state in three dimensions such that its momentum uncertainty is comparable to that of a single photon. We design an interferometric configuration where the single atom serves as an ultralight, quantum-limit beam splitter that is momentum entangled with the input photon. By varying the trap depth of the optical tweezer, we dynamically tune the atom's intrinsic momentum uncertainty, thus enabling the observation of a gradual shift in the visibility of single-photon interference. The interferometer also allows us to distinguish the classical noise caused by atom heating from the quantum-limited noise due to the momentum transfer, illustrating a quantum-to-classical transition.