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In a new report now published in Nature Communications Physics, Pedro R. Dieguez and an international team of scientists in quantum technologies, functional quantum systems and quantum physics, developed a new framework of operational criterion for physical reality. This attempt facilitated their understanding of a quantum system directly via the quantum state at each instance of time. During the work, the team established a link between the output visibility and elements of reality within an interferometer. The team provided an experimental proof-of-principle for a two-spin-½ system in an interferometric setup within a nuclear magnetic resonance platform. The outcomes validated Bohr's original formulation of the complementarity principle.

Bohr's complementarity principle states that matter and radiation can be submitted to a unifying framework where either element can behave as a wave or a particle, based on the experimental setup. According to Bohr's natural philosophy, the nature of individuality of is discussed relative to the definite arrangement of whole experiments. Almost a decade ago, physicists designed a quantum delayed choice experiment (QDCE), with a beam splitter in spatial quantum superposition to render the interferometer to have a "closed + open" configuration, while the system represented a hybrid "wave + particle" state. Researchers had previously coupled a target system to a quantum regulator and tested these ideas to show how can exhibit wave-like or particle-like behaviors depending on the experimental technique used to measure them. Based on the capability to smoothly interpolate the statistics between a wave- and particle-like pattern, physicists suggested the manifestation of morphing behaviors in the same system; claiming a radical revision of Bohr's complementarity principle.

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