Many quantum effects are easiest to detect in very small systems, such as individual atoms, molecules or photons, that are carefully isolated from their surroundings. But physicists have long wondered whether much larger objects, made of enormous numbers of particles, can also reveal unmistakable signs of quantum behavior.
Experimentalists at TU Wien have now shown that they can. The group studied a centimeter-sized crystal of a so-called strange metal and found evidence of a high level of quantum entanglement. The measurement was made possible by a precise tool from quantum information theory called quantum Fisher information.
The result creates a new link between solid state physics and quantum physics. It shows that quantum entanglement can be directly measured in a large strange metal material.
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