Even in the odd world of quantum physics, the phenomenon known as entanglement—in which two objects become tied together although not physically connected—is among the hardest to comprehend. It’s equally difficult to achieve in the lab; scientists usually have to work very hard just to do it with single atoms.

But a UChicago physicist is among a group of researchers that announced April 25 in Nature that they had managed to entangle perhaps the largest items yet, at a whopping 20 microns across—about the diameter of a single human hair.

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