With QFI, scientists can more quickly identify entangled quantum materials such as quantum spin liquids, quantum magnets, and superconductors. It is also the first to apply the technique to massive solid materials by examining many pairs of entangled spins simultaneously. This work is the most thorough examination of QFI’s capabilities to date. In addition, the experiments confirmed that entanglement increases as temperature decreases. QFI also differentiated between true quantum activity and non-quantum activity that can appear quantum due to random thermal motion. Of the three, quantum Fisher information (QFI) performed the best, routinely locating entanglement in complex materials. This research evaluated three entanglement witnesses. Entanglement is when one of these particles, or “spins,” mirrors another’s properties and behavior regardless of the distance between them. In an advance for quantum materials, scientists tested the ability of techniques called entanglement witnesses to accurately identify pairs of entangled magnetic particles. These materials could lead to completely new technologies. For example, they can be superconductors, which can allow electricity to flow with no resistance. Quantum materials behave in surprising ways because of quantum physics.
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