Austrian physicists have measured the Leggett-Garg inequality using neutron interferometry, leading to a clear conclusion: no classical theory can accurately describe reality. This study provided new evidence that a particle can exist in a superposition of two states associated with different spatial locations—even at distances of several centimeters. Can quantum objects be explained by classical theory, or do particles indeed exist in multiple places simultaneously, as quantum physics suggests? In 1985, scientists Anthony Leggett and Anupam Garg addressed this question by proposing a theoretical test: if the world can be described without invoking superposition and other quantum phenomena, it must conform to a specific inequality. If the world is truly quantum in nature, this inequality will be violated. The Leggett-Garg inequality is conceptually similar to the more widely known Bell inequality, which describes the relationship between the behaviors of two entangled objects. However, the Leggett-Garg inequality concerns the temporal evolution of a single object’s state. Scientists hypothesized that an object could be measured at different moments in time, with each measurement yielding one of two possible results. By statistically analyzing how these results correlate over time, it is possible to test whether classical realism holds. If classical realism is correct, the level of correlation cannot exceed a certain limit (with K being less than 1). However, if quantum mechanics governs the behavior of objects, then K will be greater than 1. Previous experiments have already shown violations of the Leggett-Garg inequality in various quantum systems, including photonic qubits, nuclear spins, and superconducting qubits. However, the research conducted by physicists from the Technical University of Vienna introduces notable advancements, as reported by Physics World. By using a neutron interferometer, they were able to measure the positions of neutrons in three distinct regions: in front of, inside, and behind the interferometer. “The results we obtained cannot be explained within the framework of macrorealistic theories—only by quantum theory,” said Sponar. According to the measurements, the neutron must exist in a coherent superposition of states, a fundamental property of quantum mechanics. This research shows that particles can exist in multiple places at once, which can’t be explained by classical physics. It confirms that the strange behavior predicted by quantum physics is real and can’t be described by any traditional theory. This is a big step in understanding how the quantum world works. The post No classical theory can accurately describe reality, study shows appeared first on Anomalien.com.