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Weakly interacting atomic gases at ultra low temperatures are superfluid. Owing to the high degree of control they offer, these quantum gases give access to a wonderful playground to explore superfluid dynamics. In particular, quantum gases flowing inside waveguides can mimick the behavior of electrons in superconducting circuits, opening the new field of `atomtronics’. The elementary circuit is the ring, where the atomic circulation is expected to be quantized. I will discuss two opposite limits: the production and decay of a small current of a few quanta, and the fast rotation regime where the velocity exceeds the speed of sound.
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