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

 

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 87Rb, focusing on the differential light shift between the ground-state hyperfine levels F=1,2.