A 'quantum knot' unties itself

For the first time, researchers watch as a knot formed from an ultra-cold gas decays, forming a vortex. For the first time, researchers watch as a knot formed from an ultra-cold gas decays, forming a vortex.
Author Affiliations: A structure known as a quantum knot (artist's impression) untangles itself into a vortex. Credit: Heikka Valja The quantum knot (artistically depicted) untangles into a vortex over its [...]