Researchers at the University of Basel and the Laboratoire Kastler Brossel have shown that quantum entanglement can be used to measure several physical quantities at the same time with greater accuracy than traditional methods allow.
Entanglement is often described as one of the most mysterious effects in quantum physics. When two quantum objects are entangled, measurements performed on them can remain strongly linked even when the objects are far apart. These unexpected statistical connections have no explanation in classical physics. The effect can appear as though measuring one object somehow influences the other at a distance. This phenomenon, known as the Einstein-Podolsky-Rosen paradox, was confirmed experimentally and recognized with the 2022 Nobel Prize in physics.
Building on this foundation, a team led by Prof. Dr. Philipp Treutlein at the University of Basel and Prof. Dr. Alice Sinatra at the Laboratoire Kastler Brossel (LKB) in Paris demonstrated that entanglement between quantum objects separated in space can serve a practical purpose. Their work shows that spatially separated but entangled systems can be used to measure multiple physical parameters at once with improved precision. The results of the study were recently published in the journal Science.
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