Fast Ground State Manipulation of Neutral Atoms in Microscopic Optical Traps

Abstract

We demonstrate Rabi flopping at MHz rates between ground hyperfine states of neutral ${}^{87}$Rb atoms that are trapped in two micron sized optical traps. Using tightly focused laser beams we demonstrate high fidelity, site specific Rabi rotations with crosstalk on neighboring sites separated by $8\mu \mathrm{m}$ at the level of $10^{-3}$. Ramsey spectroscopy is used to measure a dephasing time of $870\mu \mathrm{s}$ which is $\approx$ 5000 times longer than the time for a $\pi /2$ pulse.

4 pages, 4 figures