This experiment reveals flaws in using single atom scattering to support quantum complementarity principles.
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.
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Jiaqing Yan (2026) studied this question.
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