Magic polarization for optical trapping of atoms without Stark-induced dephasing

2013/11/06 by Huidong Kim, Hyok Sang Han, D. Cho · 1 citation
Physics and Astronomy · #physics.atom-ph

paper · pdf · doi:10.1103/physrevlett.111.243004

arxiv created 2013/11/06 · arxiv updated 2015/06/17

Abstract

We demonstrate that the differential ac-Stark shift of a ground-state hyperfine transition in an optical trap can be eliminated by using properly polarized trapping light. We use the vector polarizability of an alkali-metal atom to produce a polarization-dependent ac-Stark shift that resembles a Zeeman shift. We study a transition from the |2S1/2,F=2,mF=-2> to the |2S1/2,F=1,mF=-1> state of 7Li to observe 0.59+-0.02 Hz linewidth with interrogation time of 2 s and 0.82+-0.06 s coherence time of a superposition state. Implications of the narrow linewidth and the long coherence time for precision spectroscopy and quantum information processing using atoms in an optical lattice are discussed.

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