Researchers manipulated thousands of extremely cold atoms to make a ring-like defect that can change the properties of quantum objects that pass through it
. Under these conditions, all the atoms behaved as one large quantum object. Because of a quantum property called spin, that object was sensitive to magnetic fields.to determine how to pattern the direction and strength of magnetic fields in order to twist the atoms until a topological defect appeared. This approach had previously been used to create defects called monopoles, particles analogous to a magnet with a single pole.Untangle the weirdness of reality with our monthly newsletter.
“There is a peculiarity to this Alice ring. Depending on whether you look at some nearby monopole through the ring, or from the side of the ring, its charge looks different. So, the ring is inverting the charge of the objects that you look at,” says Möttönen. Computer simulations further showed that a monopole’s charge would fully flip – from positive to negative, say – if it moved through the Alice ring.
Möttönen and his colleagues have previously used this method to create topological defects in ultracold atoms, including
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