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We have observed well-defined phase slips between quantized persistentcurrent states around a toroidal atomic (23Na) Bose-Einstein condensate. Thesephase slips are induced by a weak link (a localized region of reducedsuperfluid density) rotated slowly around the ring. This is analogous to thebehavior of a superconducting loop with a weak link in the presence of anexternal magnetic field. When the weak link is rotated more rapidly,well-defined phase slips no longer occur, and vortices enter into the bulk ofthe condensate. A noteworthy feature of this system is the ability todynamically vary the weak link and hence the critical current, a feature whichis difficult to implement in superconducting or superfluid helium circuits.

Driving phase slips in a superfluid atom circuit with a rotating weak link