  A few 85Rb atoms were trapped in a micron-size magneto-optical trap with a
high quadrupole magnetic-field gradient and the number of atoms was precisely
controlled by suppressing stochastic loading and loss events via real-time
feedback on the magnetic field gradient. The measured occupation probability of
single atom was as high as 99%. Atoms up to five were also trapped with high
occupation probabilities. The present technique could be used to make a
deterministic atom source.
