Physicists Successfully Tie the Very First Quantum Knots

‘Theoretical physicists have been predicting that it should be possible for knots to form in quantum fields for decades, but nobody could figure out how to accomplish this feat experimentally. Now an international team has managed to do just that, tying knots in a superfluid for the very first time by manipulating magnetic fields.

… It’s tough to visualize these exotic objects, but they are essentially particle-like rings or loops in a quantum field connected to each other exactly once. A mathematician might not consider these structures to be true knots; typically a knot is defined as a knotted circle, like a pretzel, while a rubber band would be considered an “un-knot.” Hall and Möttönen prefer to think of their structures as knotty solitons….’

Source: Gizmodo