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We study trapping of a cold atom by a single vortex line in an extreme typeII superconducting chip, allowing for pinning and friction. We evaluate theatom's spin flip rate and its dephasing due to the vortex fluctuations inequilibrium and find that they decay rapidly when the distance to the vortexexceeds the magnetic penetration length. We find that there are special spinorientations, depending on the spin location relative to the vortex, at whichspin dephasing is considerably reduced while perpendicular directions have areduced spin flip rate. We also show that the vortex must be perpendicular tothe surface for a general shape vortex.

Single vortex fluctuations in a superconducting chip as generating dephasing and spin flips in cold atom traps