SCALAR AND VECTOR DIFFERENTIAL LIGHT SHIFT
MEASUREMENTS IN OPTICAL LATTICE-TRAPPED ^{87}RB

__Radu Chicireanu__, __Karl Nelson__, __Steven
Olmschenk__, and James V. Porto

The existence of ‘magic
wavelengths’ for hyperfine transitions in alkali atoms is of interest for their
applications in quantum information and frequency metrology. Magic wavelength
predictions for Rb and Cs have met with some controversy, and it is likely that
they do not exist in ‘traditional’ optical lattices. In a state-dependent
lattice though, the scalar and vector differential light shifts can have
opposite signs, leading to a prospected significant reduction in the
sensitivity of the transition frequency to fluctuations in the trapping light
field. We investigate this effect, and present preliminary results of a
precision measurement of light shifts in lattice-trapped ^{87}Rb,
focusing on the differential light shift between the ground-state hyperfine
levels F=1,2.