Scientists from the Research Center for Advanced Science and Technology (RCAST) at The University of Tokyo demonstrated a method for coupling a magnetic sphere with a sensor via the strange power of quantum entanglement. They showed that the existence of even a single magnetic excitation in the sphere could be detected with a one-shot measurement. This work represents a major advancement toward quantum systems that can interact with magnetic materials.

Imagine having a sensor powerful enough to tell you, in a single sweep, if a nearby haystack contained a needle or not. Such a device might seem like it could exist only in , but, using one of the most counterintuitive effects of quantum mechanics, this level of sensitivity can become reality. Entanglement, the strange process at the heart of quantum mechanics that allows linked particles to interact instantly over long distances, was once called "spooky action at a distance" by Albert Einstein.

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