Authors Referees APS Members |
December 2007, to be published in Physical Review A
Stimulated Raman spectroscopy and the determination of the $D$-fine-structure
level separation in $^{40}$Ca$^+$
We describe the results of stimulated Raman spectroscopy between the fine-structure levels, specifically $3d ^2D_{3/2}$ and $3d ^2D_{5/2}$ metastable states, in a single trapped $^{40}$Ca$^{+}$. Transitions between different Zeeman sublevels, split by an applied magnetic field, are clearly observed and the fine-structure level separation of $\nu=1\,819\,599\,021\,504 \pm 37$ Hz is determined. This measurement provides the first direct observation of this level separation. From the spectroscopic data, a prospect of using the $D$-fine structure levels as a qubit for the quantum information processing is reviewed. © 2008 The American Physical Society.
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